Kaitlyn missed 15% of the 20 questions on her science lab.How many questions did Kaitlyn answer correctly?

Answers

Answer 1

Answer: she answered 17 questions correctly.
20* .15=3
she missed 3 questions.
20-3=17

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What is the inverse of the function f(x) = 2x + 1?

Answers

Answer:

$f^(-1)$ (x) = $(x-1)/(2)$

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

y = 2x + 1 ( subtract 1 from both sides )

y - 1 = 2 ( divide both sides by 2 )

$(y-1)/(2)$ = x

Change y back into terms of x and let x = $f^(-1)$ (x), thus

$f^(-1)$ (x ) = $(x-1)/(2)$

Measures of center questions, please help.

Answers

1. The mode is C. 18
2. The median is B. 16
3. The mean is D. 14.25
4. The median is 2.3
5. The mean is 18

1) the mode is the number that repeats the most in a given set of numbers, so the answer would be c, 18
2) the median is b, 16 (if you put the numbers in chronological order, there are two middle numbers, to get the median you have to average those two numbers)
3) the mean is d, 14.25 (add all the numbers up and divide by the amount of numbers that you have [if you have 5 numbers, you divide by 5])
4) the median is 2.3
5) the mean is 18
hope this helps!

The length of AB¯¯¯¯¯ is 10 inches. A dilation with a scale factor of 25 is applied. What is the length of the image of AB¯¯¯¯¯ ?

Answers

Answer:

length of image of AB is 4 inches.

Step-by-step explanation:

Scale factor(k) is defined as the ratio of image to the pre-image.

i.e,

$k = \frac{\text{Image}}{\text{Pre-image}}$

as per the statement:

The length of AB is 10 inches. A dilation with a scale factor of $(2)/(5)$

⇒ $k= (2)/(5) =0.4$ and Length of pre-image AB = 10 inches.

by definition of scale factor:

$\text{length of image AB} = k \cdot \text{Length of Pre-image AB}$

Substitute the given values we have;

$\text{length of image AB} = 0.4 \cdot 10$

Simplify:

$\text{length of image AB} =4$ inches.

Therefore, the length of image AB is 4 inches.

The answer is 4.

I hope this helps. :)

Please help me I'm on a time crunch

Answers

You multiple it by 20....
1:20
2:40
3:60
4:80
5:100
So it’s 80 inches by 100 inches (80x100) =800 square feet

I was going to try to answer but the guy above answered it perfect aha

Ishaan is 3 times as old as Christopher and is also 14 years older than Christopher.how old is ishann?

Answers

The correct answer is: 21

Explanation:
Let's first assume few variables!

x = Ishann's age (in years)
y = Christopher's age (in years)

1. Ishann is 3 times as old as Christopher can be represented mathematically as:
x = 3y ---- (1)

2. Ishann is 14 years older than Christopher can be represented mathematically as:
x = y + 14 ---- (2)

Get the value of y from Equation (1) and plug it in Equation (2):

(2) => x = (x/3) + 14
3x = x + 42
2x = 42
x = 21

Hence Ishann is 21 years old!

Answer:

the answer in khan academy is 7

Step-by-step explanation:

Describe the rays of an angle that measures 1/2 turn

Answers

A complete turn is referred to as a perigon angle or a full angle and has a measurement of 360 degrees. A 1/2 turn is termed as a straight angle which has a measure of 180 degrees. It is termed as such because it looks like a straight line. A ray is part of a line. It has one end point and the other end goes on and on forever.

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