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lina2011 [118]
3 years ago
15

21 is 75%, percent of what number?

Mathematics
2 answers:
ELEN [110]3 years ago
8 0

Answer:

28

Step-by-step explanation:

x • 3/4 = 21

Multiply both sides by 4/3 to cancel out 3/4.

x = 21 • 4/3

x = 64/3

x = 28

Plug it back into the equation to make sure it works.

28 • 3/4 = 21

64/4 = 21✓

Murljashka [212]3 years ago
6 0

Answer:

28 would be your answer

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manufacturing company produces digital cameras and claim that their products maybe 3% defective. A video company, when purchasin
alexdok [17]

Answer:

P(X>17) = 0.979

Step-by-step explanation:

Probability that a camera is defective, p = 3% = 3/100 = 0.03

20 cameras were randomly selected.i.e sample size, n = 20

Probability that a camera is working, q = 1 - p = 1 - 0.03 = 0.97

Probability that more than 17 cameras are working P ( X > 17)

This is a binomial distribution P(X = r) nCr q^{r} p^{n-r}

nCr = \frac{n!}{(n-r)!r!}

P(X>17) = P(X=18) + P(X=19) + P(X=20)

P(X=18) = 20C18 * 0.97^{18} * 0.03^{20-18}

P(X=18) = 20C18 * 0.97^{18} * 0.03^{2}

P(X=18) = 0.0988

P(X=19) = 20C19 * 0.97^{19} * 0.03^{20-19}

P(X=19) = 20C19 * 0.97^{19} * 0.03^{1}

P(X=19) = 0.3364

P(X=20) = 20C20 * 0.97^{20} * 0.03^{20-20}

P(X=20) = 20C20 * 0.97^{20} * 0.03^{0}

P(X=20) = 0.5438

P(X>17) = 0.0988 + 0.3364 + 0.5438

P(X>17) = 0.979

The probability that there are more than 17 working cameras should be 0.979 for the company to accept the whole batch

6 0
3 years ago
Josh has $9.00. Bagels cost $0.70 each and a small container of cream cheese cost $2.50. What is the greatest number of bagels J
deff fn [24]

Answer:

Josh's 9.00

Bagel cost 0.70

Ice cream 2.50

9.00–2.50=6.50

6.50

6.50 \div 0.70 7

=10

7 0
3 years ago
Can anyone help me with this problem
lapo4ka [179]
I believe that it is 1. 20 degrees and 2. 80 degrees
3 0
3 years ago
What is the volume of the composite figure?
saw5 [17]

volume of a sphere is 4/3 * PI * r^3

r = 6

r^3 = 6^3 = 216

4/3 * 216 = 288

 Volume = 288 PI in^3

3 0
3 years ago
Together, the areas of the rectangles sum to 30 square centimeters.
Juli2301 [7.4K]

Answer:

3x+2y

Step-by-step explanation:

Find the rectangles attached

Area of a rectangle = Length * Width

A = A1+A2

given

A = 30cm²

A1 = 3 * x

A1 = 3x

A2 = 2*y

A2 = 2y

Substitute

30 = 3x+2y

Hence the required equation is 3x+2y = 30

6 0
3 years ago
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