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3 years ago

HELP PLEASE!!!

Mathematics

1 answer:

givi [52]3 years ago

4 0

The answer is C because:
It is keeping it identity through the multiplication.

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A body builder consumed 4,400 calories yesterday. Today, he consumed 3,600 calories . What is the percent decrease in number of

IgorC [24]

Answer:

it's about 18 percent decrease**** so 20 percent to round up

Step-by-step explanation:

5 0

3 years ago

What is the value of x in the equation (x-2/3)+(1/60)=(5/6)

Roman55 [17]

(x-2/3)+(1/60)=(5/6)
x-2/3= 5/6 - 1/60
x-2/3 = 49/60
x - 2 = 49/20
x = 49/20 + 2
x = 89/20

The answer is: x = 89/20 or x = 4.45.

4 0

3 years ago

What is -15x=0 solution

cricket20 [7]

Here is the method for solving that equation:

Step #1: Write the equation:

-15x = 0

Step #2: Divide each side of the equation by -15 :

x = 0

3 0

3 years ago

The students at Southern Junior High School are divided into four homerooms. Benjamin just moved into the school district and wi

Klio2033 [76]

Answer:

yes

Step-by-step explanation:

3 0

3 years ago

A manufacturer of running shoes knows that the average lifetime for a particular model of shoes is 15 months. Someone in the res

Alexus [3.1K]

Answer:

Step-by-step explanation:

Hello!

So you have a new type of shoe that lasts presumably longer than the ones that are on the market. So your study variable is:

X: "Lifetime of one shoe pair of the new model"

Applying CLT:

X[bar]≈N(μ;σ²/n)

Known values:

n= 30 shoe pairs

x[bar]: 17 months

S= 5.5 months

Since you have to prove whether the new shoes last more or less than the old ones your statistical hypothesis are:

H₀:μ=15

H₁:μ≠15

The significance level for the test is given: α: 0.05

Your critical region will be two-tailed:

$Z_{\alpha /2} = Z_{0.025}= -1.96$

$Z_{1-\alpha /2} = Z_{0.975}= 1.96$

So you'll reject the null Hypothesis if your calculated value is ≤-1.96 or if it is ≥1.96

Now you calculate your observed Z-value

Z=x[bar]-μ ⇒ Z= 17-15 = 1.99

σ/√n 5.5/√30

Since this value is greater than the right critical value, i.e. Zobs(1.99)>1.96 you reject the null Hypothesis. So the average durability of the new shoe model is different than 15 months.

I hope you have a SUPER day!

5 0

3 years ago