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2 years ago

10

Pedro spent 57 minutes doing his math and language arts homework. His language arts homework took him twice as long as his math

homework. How much time did he spent on his language arts homework?

1 answer:

myrzilka [38]2 years ago

8 0

Pedro's language arts homework took him 38 minutes to do

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-1.4 -1 and 1/25 -1.25 least to greatest

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-1.4, -1.25, 1/25 is the answer

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3 years ago

I need blank 1 and blank 2

lord [1]

Answer:

Blank 1: 40

Blank 2: 10

Step-by-step explanation:

You can start by representing the speed of the water as x and the speed of the dolphin as y, and writing an equation.

y+x=50

y-x=30

Adding these two equations together, you get:

2y=80

y=40 for the speed of the dolphin in still water. Now, you an use one of the previous equations to find the speed of the current.

40-x=30

x=10

Hope this helps!

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3 years ago

A multiple choice test has four possible answers for each question. Let X be the number of correct responses in a test of 100 qu

dimulka [17.4K]

Answer:

a. 4.33.

Step-by-step explanation:

If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25

Sample size (n) = 100 questions

The standard deviation of a proportion 'p' is given by:

$s=\sqrt{\frac{p*(1-p)}{n} }$

Applying the given data:

$s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433$

If X is the number of correct responses in 100 guesses, the standard deviation of X is:

$\sigma = n*s=100*0.0433\\\sigma = 4.33$

The standard deviation of X is 4.33 questions.

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2 years ago

Which of the following best describes the algebraic expression 5(x+2)-3

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D. Three less than five times the quantity of a number plus two.

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