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3 years ago

Can someone answer asap!!?!? I’ll mark brainlist please help me

Mathematics

2 answers:

Yakvenalex [24]3 years ago

6 0

Answer:

I would honestly choose 9

Step-by-step explanation:

Because it is using cross products and you want them to equal the same, so you take 6 x 12= 72 so you take 8 and multiply by each number Each time you know 72 x 8 wont work and the 576 wont work and that .75 is going to be way too little therefore its 9 and you can check by multiplying 8 x 9= 72

dedylja [7]3 years ago

5 0

Answer:

Step-by-step explanation:

8/12=2/3

6/9=2/3

You might be interested in

How do the gcf and the lcm help you when multiplying and adding or subracting fractions

kari74 [83]

<h3>Explanation:</h3>

GCF: the greatest common factor of numerator and denominator is a factor that can be removed to reduce the fraction.

Example

The numerator and denominator of 6/8 have GCF of 2:

6/8 = (2·3)/(2·4)

The fraction can be reduced by canceling those factors.

(2·3)/(2·4) = (2/2)·(3/4) = 1·(3/4) = 3/4

___

LCM: the least common multiple of the denominators is suitable as a common denominator. Addition and subtraction are easily performed on the numerators when the denominator is common.

Example

The fractions 2/3 and 1/5 can be added using a common denominator of LCM(3, 5) = 15.

2/3 + 1/5 = 10/15 + 3/15 = (10+3)/15 = 13/15

4 0

3 years ago

find the surface area of rectangular prison with a width,length and height of 3m and 15m respectively

Shalnov [3]

Answer:

A=45m^2

Step-by-step explanation:

l*w

4 0

3 years ago

How many 1/10's are in 2/5?

goblinko [34]

There is 4 1/10's in 2/5.

You do this by turning 2/5 into a fraction with a denominator of 10, so it will be 4/10. 1/10 + 1/10 + 1/10 + 1/10 = 4/10

3 0

4 years ago

if jennifer walked 9 miles in 3 hours, how many miles will jennifer walk in 5 hours at the same constant speed ?

alexandr402 [8]

15. is your answer. have a good day

3 0

3 years ago

Read 2 more answers

A sociologist wants to determine if the life expectancy of people in africa is less than the life expectancy of people in asia.

Colt1911 [192]

Answer:

The sample statistics are attached.

First, we need to determine the hypothesis.

The null hypothesis should be: $H_{o} : u_{africa} \geq u_{asia}$ .

The alternative hypothesis should be: $H_{a}: u_{africa}$

The next step is about calculating the t statistics based on the samples. This t test will give the probability value or p-value, which determines if there's enough to reject the null hypothesis. The formula we need to use to find the t-value is: $t=\frac{x_{1}-x_{2} }{\sqrt{\frac{s_{1} ^{2} }{n_{1} } +\frac{s_{2} ^{2} }{n_{2} } } }$

Replacing all the values into the formula, we have:

$t=\frac{52.4-58.1}{\sqrt{\frac{(7.4)^{2} }{45}+\frac{(8.8)^{2} }{35} } } \\t=\frac{-5.7}{\sqrt{1.2+2.2} } =\frac{-5.7}{1.8} =-3.2$

Therefore, the t-value is -3.2.

Now, we using a level of significance of 0.01, and a degree of freedom (df) of 34, we use the t-table to find the p-value for this results. (df = N -1; in this case, we take the smaller sample, which is 35, giving us 34 of df).

Therefore, according to the table attached, the p-value is less than 0.01, which is less than our level of significance. This result means that the null hypothesis is rejected. In other words, there's enough evidence to say that the life expectancy of people in Africa is less than the life of expectancy of people in Asia.

3 0

3 years ago