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3 years ago

Solve: 12 dogs decreased by 25% step by step pls.

2 answers:

8 0

Decreased by 25%
find 25% of 12 and decrease 12 by it

percent means parts out of 100
25%=25/100=1/4
'of' means multiply
25% of 12=1/4 times 12=3

decrease 12 by 3
12-3=9

answer is 9

kramer3 years ago

7 0

first turn 25% into a decimal so it's easier to work with, the decimal for 25% is 0.25

then multiply the number by the decimal

12x0.25=3

then subtract your answer (3) from your starting number

12-3=9

12 dogs decreased by 25% leaves you with 9 dogs left.

if you are increasing, divide instead of multiply

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The test statistic value lies to the right of the critical value. So we have sufficient evidence to reject the null hypothesis.

<h3>What are null hypotheses and alternative hypotheses?</h3>

In null hypotheses, there is no relationship between the two phenomenons under the assumption or it is not associated with the group. And in alternative hypotheses, there is a relationship between the two chosen unknowns.

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Hₐ: $\mu _d > 0$

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More about the null hypotheses and alternative hypotheses link is given below.

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2 years ago

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pshichka [43]

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3 years ago

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lana66690 [7]

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3 years ago

Car A began a journey from a point at 9 am, traveling at 30 mph. At 10 am car B started traveling from the same point at 40 mph

Natasha2012 [34]

Let after t hours the distances D1 traveled by car A

=> D1 = 30 t

Car B starts at 10 am and will, therefore, have spent one hour less than car A when it passes it.

After (t - 1) hours, distance D2 traveled by car B 

=> D2 = 40 (t - 1)

When car B passes car A, they are at the same distance from the starting point and therefore D1 = D2 

=> 30 t = 40 (t - 1)

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3 years ago

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