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3 years ago

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A math teacher gave her class two tests. Twenty-five percent of the class passed both tests and 42 percent of the class passed o

nly the first test. What percent of the students who passed the first test also passed the second?

1 answer:

Norma-Jean [14]3 years ago

4 0

25% of the class who passed the first test also passed the second

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Y = 30 + .25x

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3 years ago

What is the value of the expression 52 + 22?

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Answer:

55 + 22 = n

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Step-by-step explanation:

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3 years ago

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Answer:

Step-by-step explanation:

4) C looks pretty good

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3 years ago

Prove that 1-tan^2x/1+tan^2x=2cos^2x-1

katen-ka-za [31]

Answer:

see explanation

Step-by-step explanation:

Using the trigonometric identities

tan x = $\frac{sinx}{cosx}$ , sin²x + cos²x = 1

Consider the left side

$\frac{1-tan^2x}{1+tan^2x}$

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= $\frac{cos^2x-sin^2x}{cos^2x+sin^2x}$

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3 0

4 years ago

Read 2 more answers

There are 28.35 grams in an ounce and 2.21 pounds in a kilogram. Miriam converted 7 kilograms to ounces, but her answer is not c

sergejj [24]

Answer: OPTION C.

Step-by-step explanation:

For this exercise it is important to remember the following:

$1\ kilogram=1,000\ grams$

Knowing this and based on the information provided in the exercise, you can make the conversion from kilograms to ounces. This is:

$(7\ Kg)(\frac{1,000\ gr}{1\ Kg})(\frac{1\ oz}{28.35\ gr})=246.913\ oz$

According to the exercise, Miriam's procedure was:

$(7\ Kg)(\frac{1,000\ gr}{1\ Kg})(\frac{28.35\ gr}{1\ oz})= 198,450\ oz$

So you can identify that she made a mistake.

Notice that:

1. Miriaim multiplied correctly.

2. Butt the third fraction should be $\frac{1\ oz}{28.35\ gr}$ and not $\frac{28.35\ gr}{1\ oz}$ .

5 0

3 years ago

Read 2 more answers