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3 years ago

What is the answer for 21÷1/3?

Mathematics

2 answers:

77julia77 [94]3 years ago

3 0

Answer:

Step-by-step explanation:

21*3=63

hope this helps..

devlian [24]3 years ago

3 0

Answer:

Step-by-step explanation:

You first convert 1/3 to 3, and division to multiplication. The equation is now 21 x 3, which is equal to 63.

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DENIUS [597]

Answer:

$ 16.50

y = 1.50m + 3

Step-by-step explanation:

1.50(9) + 3 = $16.50

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2 years ago

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krek1111 [17]

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3 years ago

<A and <B are complementary

gizmo_the_mogwai [7]

Answer:

<A = 62

Step-by-step explanation:

<A and <B add up to 90 degrees. Definition of Complementary.

<A + <B = 90

(6x - 4) + (x + 17) = 90

7x + 13 = 90

7x = 77

x = 11

<A = 6x - 4

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<A = 66 - 4

<A = 62

3 0

3 years ago

A machine making computer chips isn't working correctly, and 5% of the computer chips it makes are defective. If an inspector ch

Rainbow [258]

Answer:

0.25% probability that they are both defective

Step-by-step explanation:

For each computer chip, there are only two possible outcomes. Either they are defective, or they are not. The probability of a computer chip being defective is independent of other chips. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

5% of the computer chips it makes are defective.

This means that $p = 0.05$

If an inspector chooses two computer chips randomly (meaning they are independent from each other), what is the probability that they are both defective?

This is P(X = 2) when n = 2. So

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 2) = C_{2,2}.(0.05)^{2}.(0.95)^{0} = 0.0025$

0.25% probability that they are both defective

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3 years ago

ivy bought 10 packs of cups for her holiday party. a pack of medium cups costs $1.80 and a pack of large cups costs $2.40. she p

DENIUS [597]

Answer:

4 packs of medium cups and 6 packs of large cups

Step-by-step explanation:

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1.80(4) + 2.40(6) = 21.60

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21.60 = 21.60

4 0

4 years ago

Read 2 more answers