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2 years ago

If 30% of students failed their last test, and there were 40 students that took the test, how many students failed?

Mathematics

1 answer:

Gnom [1K]2 years ago

8 0

Answer:

12.

Step-by-step explanation:

30% of 40 is 12. To calculate x% of a number y, we use the following rule: x% of y = (x / 100) × y.

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Elijah used 17 connecting cubes to make a model kitchen. the kitchen model is in the shape of a rectangle and is one cube high.

Archy [21]

There is only one way, a rectangle that is one block by 17 blocks. This is because the only factors of 17 are 1 and 17.

5 0

3 years ago

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If 3 dozen cookies require 1 cup of sugar, write a direct variation equation in two variables that represent this situation. Mak

PIT_PIT [208]

Answer:

Step-by-step explanation:

10 multiply 1/3 makes three full cups. Fu*kin* idiot

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3 years ago

If f(x) = x-9, then f '(x) =

erica [24]

Answer:

Step-by-step explanation:

If you are just looking for the derivative, then all you need to use the power rule for this. Technically the x in (x-9) has a power to the 1, so really x^1-9. To use power rule, you bring down the exponent, in this case, 1, and then minus 1 from what the exponent was.

1x^(1-1) = 1x^0. The derivative of any constant is 0, so don't even worry about the -9. We know that anything raised to the zero is just 1, so in this case your answer is 1.

Hope this helps :)

4 0

2 years ago

Find the area of the circle with the given diameter. Use 3.14 for π. Round to two decimal places.

harkovskaia [24]

Answer:

14.13 m^2

Step-by-step explanation:

Formula for area:

3.14*r^2

To find the radius(r), you do diameter(d)/2:

9/2=4.5

3.14*4.5^2=14.13 m2

6 0

2 years ago

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Two cards are drawn without replacement from a standard deck of 52 playing cards. What is the probability of choosing a king and

STALIN [3.7K]

Answer:

0.0181 probability of choosing a king and then, without replacement, a face card.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

Probability of choosing a king:

There are four kings on a standard deck of 52 cards, so:

$P(A) = \frac{4}{52} = \frac{1}{13}$

Probability of choosing a face card, considering the previous card was a king.

12 face cards out of 51. So

$P(B|A) = \frac{12}{51}$

What is the probability of choosing a king and then, without replacement, a face card?

$P(A \cap B) = P(A)P(B|A) = \frac{1}{13} \times \frac{12}{51} = \frac{1*12}{13*51} = 0.0181$

0.0181 probability of choosing a king and then, without replacement, a face card.

5 0

3 years ago