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SashulF [63]
3 years ago
7

Help please and thanks​

Mathematics
2 answers:
Mandarinka [93]3 years ago
8 0
30 dolls.. hope you get a good grade
Tasya [4]3 years ago
6 0

Answer:

there are 30 dolls in total

Step-by-step explanation:

Since 20% = 6 dolls ur gonna multiply that by 5 which gets 100% = 30

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Please help thank you.
marusya05 [52]
This problem can be completed in 2 ways. Both are acceptable.

Option 1:


This is an isosceles trapezoid that can be divided into a rectangle and two congruent triangles.

The area of the rectangle is the base times the height.

9 \times 4=36

The area of one of the triangles is half the base times the height.

\dfrac{1}{2} \times 5 \times 4 = 10

The other triangle must have that area too.

36+10+10=56

The area is 56 square centimeters.

Option 2:

We can use the area formula for the trapezoid.

A=\dfrac{b_1+b_2}{2} \times h

Where b_1 is the length of the shorter base
and b_2 is the length of the longer base
and h is the height.

The length of the shorter base is 9.
The length of the longer base is 9+5+5, or 19.

The height is 4.

A=\dfrac{9+19}{2} \times 4

=56

Same answer. The area is 56 square centimeters.

Both options are two acceptable ways the problem can be tackled.
7 0
3 years ago
Aaron needs 24 inches of copper wire for an experiment. The wire is sold by the centimeter. Given that 1 inch = 2.54 centimeters
tatiyna

\frac{1}{2.54} =\frac{24}{x}

Multiply both sides by 2.54.

1=\frac{24}{x} (2.54)

= \frac{60.96}{x}

Multiply both sides by x.

x = 60.96

Hence, Aaron needs 60.96 centimeters of wire.

8 0
3 years ago
You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question. Suppose that you h
damaskus [11]

Answer:

a) Expected score on the exam is 12.8.

b) Variance 10.24, Standard deviation 3.2

Step-by-step explanation:

For each question, there are only two possible outcomes. Either you guesses the answer correctly, or you does not. The probability of guessing the answer of a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

E(X) = np

The variance of the binomial distribution is:

V(X) = np(1-p)

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

64 questions.

So n = 64

5 possible answers, one correctly, chosen at random:

So p = \frac{1}{5} = 0.2

(a) What is your expected score on the exam?

E(X) = np = 64*0.2 = 12.8

(b) Compute the variance and standard deviation of x. Variance =Standard deviation

V(X) = np(1-p) = 64*0.2*0.8 = 10.24

Variance 10.24

\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{64*0.2*0.8} = 3.2

Standard deviation 3.2

5 0
3 years ago
The side length of an isosceles right triangle is 7x + 3 feet. (both base and height are 7x + 3 feet).
tangare [24]

Answer:

21

Step-by-step explanation:

because they all sum up together

4 0
2 years ago
What is a proportation??<br> I need help
Elden [556K]

Answer:

what probortation?

Step-by-step explanation:

5 0
2 years ago
Read 2 more answers
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