Answer:
60
Step-by-step explanation:
He needs to write 300*9 pages which is 2700
We know that he writes 45 pages a minute
his speed can be shown through the following equations
45x=pages typed
where x=minutes
so we set up our problem
45x=2700
we divide by 45 and get x=60
Which of the following would have a scale factor greater than one?
a) A Hot Wheels car
b) A picture of a skyscraper
c) A map of the world
d) A diagram of a plant cell
Answer:
NIO
Step-by-step explanation:
a
(40 points) !!!!!!!URGENT!!!!!! jack and jill both drive the same distance to the beach. by driving 15 mph faster than jack jill can get there in 3 hours while it takes jack 4 hours. how fast does each of them drive !!!!!!URGENT!!!!!
read and analyze the problem below. Was the problem solved correctly? If not, explain the error and answer it correctly.
Solve:
2x - 8 + 3x + 2 = 4x + 10 + 3x - 6
student work:
2x - 8 + 3x + 2 = 4x + 10 + 3x - 6
5x - 6 = 7x + 16
-5x -5x
-6 = 2x + 16
-16 -16
-22 = 2x
2 2
-11 = x
PLEASE HELP ME!
25x(x + 5)
80 points I need answer ASAP
Answer:
[tex]25 {x}^{2} + 125x[/tex]
hope it helpsWhat would be the first step you do to solve the equation below?
2x - 4 = 12
Plz help I’m bad at algebraic expressions and translating them.
Here are the expressions.
1.Four more than a number
2.The difference of a number and 9
3.Two times a number plus 6
4.The quotient of n and 6
5.2 times the sum of a number and 3
Answer:
1. 4+n
2. n-9
3. 2n + 6
4. n/6
5. 2(n+3)
Step-by-step explanation:
The taxi and takeoff time for commercial jets is a random variable x with a mean of 8 minutes and a standard deviation of 2.8 minutes. Assume that the distribution of taxi and takeoff times is approximately normal. You may assume that the jets are lined up on a runway so that one taxies and takes off immediately after the other, and that they take off one at a time on a given runway.
A button hyperlink to the SALT program that reads: Use SALT.
(a) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be less than 320 minutes? (Round your answer to four decimal places.)
Incorrect: Your answer is incorrect.
(b) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be more than 275 minutes? (Round your answer to four decimal places.)
Incorrect: Your answer is incorrect.
(c) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be between 275 and 320 minutes? (Round your answer to four decimal places.)
Incorrect: Your answer is incorrect.
Need Help? Read It
Answer:
a) 0.9207 = 92.07% probability that for 37 jets on a given runway, total taxi and takeoff time will be less than 320 minutes
b) 0.8907 = 89.07% probability that for 37 jets on a given runway, total taxi and takeoff time will be more than 275 minutes
c) 0.8114 = 81.14% probability that for 37 jets on a given runway, total taxi and takeoff time will be between 275 and 320 minutes
Step-by-step explanation:
To solve this question, we need to understand the normal probability distribution and the central limit theorem.
Normal probability distribution
When the distribution is normal, we use the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
Central Limit Theorem
The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean [tex]\mu[/tex] and standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For sum of n normally distributed variables, the mean is [tex]\mu*n[/tex] and the standard deviation is [tex]s = \sigma\sqrt{n}[/tex].
For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean [tex]\mu = p[/tex] and standard deviation [tex]s = \sqrt{\frac{p(1-p)}{n}}[/tex]
In this question, we have that:
For a single commercial jet:
[tex]\mu = 8, \sigma = 2.8[/tex]
For the 37 jets combined:
[tex]\mu = 37*8 = 296, s = 2.8\sqrt{37} = 17.03[/tex]
(a) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be less than 320 minutes?
This is the pvalue of Z when X = 320. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{320 - 296}{17.03}[/tex]
[tex]Z = 1.41[/tex]
[tex]Z = 1.41[/tex] has a pvalue of 0.9207
0.9207 = 92.07% probability that for 37 jets on a given runway, total taxi and takeoff time will be less than 320 minutes.
(b) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be more than 275 minutes?
This is 1 subtracted by the pvalue of Z when [tex]X = 275[/tex]. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{275 - 296}{17.03}[/tex]
[tex]Z = -1.23[/tex]
[tex]Z = -1.23[/tex] has a pvalue of 0.1093
1 - 0.1093 = 0.8907
0.8907 = 89.07% probability that for 37 jets on a given runway, total taxi and takeoff time will be more than 275 minutes.
(c) What is the probability that for 37 jets on a given runway, total taxi and takeoff time will be between 275 and 320 minutes?
This is the pvalue of Z when [tex]X = 320[/tex] subtracted by the pvalue of | when [tex]X = 275[/tex]
From a and b
0.9207 - 0.1093 = 0.8114
0.8114 = 81.14% probability that for 37 jets on a given runway, total taxi and takeoff time will be between 275 and 320 minutes
What is an equation in point-slope form of the line that passes through the point (6, −2) and has a slope of 3? A. y + 2 = 3(x − 6) B. y + 2 = −3(x − 4) C. y + 1 = 6(x − 4) D. y + 1 = −6(x + 4)
Answer:
answer A is correct because the formula of equation in point slope is
y-y1=m(x-x1)
where,(x1,y1)point is given that is (6,-2)
slope=m=3
equation in point-slope form of the line that passes through the point (6, −2) and has a slope of 3 is y + 2 = 3(x − 6)
What is Equation?statement of equality between two expressions consisting of variables and/or numbers.
As, equation line is:
y-y1=m(x-x1)
We have,
coordinates (6, −2) and slope=3
So,
y+2=3(x-6)
y+2=3x-18
y-3x= -20
Hence, equation in point-slope form of the line that passes through the point (6, −2) and has a slope of 3 is y+2=3(x-6).
Learn more about equation here:
https://brainly.com/question/21511618
#SPJ2
Juan bought fruit from the grocery store. The variables below define his purchase. Juan’s bananas cost half as much as apples. Which equations can be used to model his purchase? Select each correct equation. *
Answer:
[tex]B = \frac{1}{2}A[/tex]
[tex]A = 2B[/tex]
Step-by-step explanation:
Given
Represent apple with A and Banana with B
Required
Determine the relationship between A and B
From the question, we understand that:
B costs half as much as A
This can be represented as:
[tex]B = \frac{1}{2} * A[/tex]
[tex]B = \frac{1}{2}A[/tex]
Multiply both sides by 2
[tex]2*B = \frac{1}{2}A*2[/tex]
[tex]2B = A[/tex]
[tex]A = 2B[/tex]
What was the error made in this conversion?
A.)The 1 mile and 3,218 meters in Step 1 should be switched.
B.) The 1,609 meters and the 3,218 meters in Step 1 should be switched.
C.)The conversion factor should be added in Step 2 instead of being multiplied.
D.)The conversion factor should be divided in Step 2 instead of being multiplied.
Answer:
B.) The 1,609 meters and the 3,218 meters in Step 1 should be switched.Step-by-step explanation:
Step 1 is incorrect. It should be:
3218 meters x 1 mile / 1609 meters = 2 milesCorrect answer option is B
what is the value of the expression shown? 7 [(7 + 7) +7
Answer:
105
Step-by-step explanation:
7 (7x7) + 7 is the same as 7 x 14 + 7 so that would equal 105
x is. 2 less than. y
Answer:
x is 2 less than y
[tex] \huge \boxed{x = y - 2}[/tex]
what are numbers that are the same distance from 0 but in opposite directions
Answer:
Opposite numbers
Step-by-step explanation:
Opposite numbers are defined as numbers that have the same distance from zero but are on opposite sides of zero. So opposite numbers have the same absolute values. Another word for opposite numbers is additive inverses because when opposite numbers are added together the sum is always zero.
7 2/3
16 3/5
+ 8 1/2
______
Leilany was on a treadmill and ran 1 mile in 9 minutes. How many minutes will it take her to run 3 miles?
Answer:
27
Step-by-step explanation:
1 mile took 9 min to run, so 3 miles will be:
3 x 9 =
27
P= x/3 and x = 1/2 y. Write p in terms of y
Answer:
p = 1/2y - 3
Step-by-step explanation:
p=x/3 and x=1/2y [replace the "x" to solve]
p = (1/2y)/3
Choose the A that seems to be congruent to the given one.
AADBA
OECB
BCA
EAB
Answer:
BCA
Step-by-step explanation:
assuming the shape is symmetrical, BCA would be the congruent (equal) angle
8) 3(2x+1) = ?*
O 6x + 3
5x + 1
5x + 3
6x + 1
Answer:
6x + 3
General Formulas and Concepts:
Pre-Algebra
Distributive Property
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightStep-by-step explanation:
Step 1: Define
3(2x + 1)
Step 2: Expand
Distribute 3: 3(2x) + 3(1)Multiply: 6x + 3Find the first five terms for the following arithmetic sequence Tn=5n-6?
Answer:
The first five terms are -1,4,9,14 and 19.
Step-by-step explanation:
The arithmetic sequence is :
[tex]T_n=5n-6[/tex]
We need to find the first five terms of the sequence.
Put n = 1 for first term.
[tex]T_1=5(1)-6=-1[/tex]
Put n = 2 for second term.
[tex]T_2=5(2)-6=\\\\=10-6\\\\=4[/tex]
Put n = 3 for third term.
[tex]T_3=5(3)-6=\\\\=15-6\\\\=9[/tex]
Put n = 4 for fourth term.
[tex]T_4=5(4)-6=\\\\=20-6\\\\=14[/tex]
Put n = 5 for fifth term.
[tex]T_3=5(5)-6=\\\\=25-6\\\\=19[/tex]
Hence, the first five terms are -1,4,9,14 and 19.
Highschool level trigonometry!!! Need help knowing step by step how to find answer!
A ladder is 15 m long. The top of the ladder rests against the wall of a house, and the foot rests on level ground 2m from the wall. Draw a diagram to illustrate the situation. Calculate the angle between the ladder and the ground.
Answer:
[tex]\theta \approx 82.34^\circ[/tex]
Step-by-step explanation:
Please refer to the attached diagram. (Apologies if the shading or resolution is a bit off.)
So, we want to find θ.
Since we formed a right triangle, we can use right triangle ratios.
We know the measure of the adjacent side to θ and the hypotenuse.
Therefore, we will use the cosine ratio:
[tex]\displaystyle \cos(\theta)=\frac{\text{adjacent}}{\text{hypotenuse}}[/tex]
The adjacent side is 2 and the hypotenuse is 15. By substitution:
[tex]\displaystyle \cos(\theta)=\frac{2}{15}[/tex]
Now, we will take the inverse cosine of both sides. So:
[tex]\displaystyle \theta=\cos^{-1}\Big(\frac{2}{15}\Big)[/tex]
Use a calculator. Hence:
[tex]\theta \approx 82.34^\circ[/tex]
The angle between the ground and the ladder is about 82.34°.
9x - 3 + x² , when x = 4
Step-by-step explanation:
=9x-3+x²
=9×4-3+4²
=36-3+16
=49
hope it helps.
#11: Write the equation below in standard form.
*
y - 2 = -4(x - 1)
Answer:
y - 2 = -4x + 4
Step-by-step explanation:
Just simplify is out ^-^
4 x + y = 6 Should do the trick
7. Wr ite a multiplication equation that represents the question: how many 2/5s are in 9/4?* Your answer
Answer:
how many 2/5s are in 9/4? - it would be two
hope this helps
if you can get 3 pints of raspberries for $12.00 how many pints can you get per dollar
Answer:
0.25 pints of raspberries do you get per dollar
Caroline was thinking of a number. Caroline halves the number and gets 7.3. Form an equation with x from the information.
Answer:
The equation is: [tex]\frac{x}{2} = 7.3[/tex]
Step-by-step explanation:
Caroline was thinking of a number.
We are going to call this number x.
Caroline halves the number and gets 7.3.
To find half of a number, we multiply by 1/2. So
[tex]\frac{1}{2} \times x = 7.3[/tex]
[tex]\frac{x}{2} = 7.3[/tex]
what is the square of 2/3
Answer:
4/9
Step-by-step explanation:
or,2×2=4
or,3×3=9
or,4/9
What is 10% of $10 what is 10% of $10
Answer:
$9
Step-by-step explanation:
This means the cost of the item to you is $9. You will pay $9 for a item with original price of $10 when discounted 10%. In this example, if you buy an item at $10 with 10% discount, you will pay 10 - 1 = 9 dollars.
JK=2x+5 and KL=3x-8 find JL
Answer:
Step-by-step explanation:
3x -8 = 2x + 5
x - 8 = 5
x = 13
3(13) - 8 + 2(13) + 5
39 - 8 + 26 + 5
31 + 31 = 62
A boat travels 8 miles north from point A to point B. Then it moves in the direction 5 40°W and reaches point Finally, it turns 5 40° E and
returns to point A
The total distance covered by the boat is going how many
miles.
A. 14.95
B. 18.44
C. 20.04
D. 25.88
Answer:
B, 18.44 miles
PLEASE HELP ME 20 POINTS!!!!!!!!!!! In the plane shown in the figure below, lines land mare cut by the transversal line n. The eight angles at the
intersections of these lines are labeled. Which of the following statements, when it is true, CANNOT always be used
to prove that lines land mare parallel?
Answer:
Option (4)
Step-by-step explanation:
Since, lines l and m are the parallel lines and line 'n' is intersecting these parallel lines,
Option (1)
∠c ≅ ∠y
True.
[Corresponding interior angles]
Option (2)
∠a ≅ ∠w
True.
[Corresponding interior angles]
Option (3)
∠b ≅ ∠x
True.
[Corresponding interior angles]
Option (4)
∠b ≅ ∠z
False.
[Since, ∠b + ∠Z = 180°, consecutive exterior angles]
Option (5)
∠a ≅ ∠z
True.
[Alternate exterior angles]
Therefore, Option (4) will be the answer.