2 years ago

NEED HELPPPP!!!!!!!!!

Mathematics

1 answer:

weqwewe [10]2 years ago

7 0

Answer:

i think d but i don't know for sure

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Simplify 59.95m − 30 + 7.95m + 45 + 9.49m

Ksju [112]

Answer:

77.39m + 15

Step-by-step explanation:

To simplify, we add all the common terms among themselves.

We have terms with the unit m and terms without any unit. So we add them among themselves.

59.95m − 30 + 7.95m + 45 + 9.49m

(59.95 + 7.95 + 9.49)m + (-30 + 45)

77.39m + 15

3 0

3 years ago

In a random sample of 60 dog owners enrolled in obedience training, it was determined that the mean amount of money spent per ow

Anton [14]

Answer: $(\$106.29,\ \$112.37)$

Step-by-step explanation:

Given : Sample size : $n=60$

The mean amount of money spent per owner = $\$109.33\text{ per class}$

Standard deviation : $\sigma=\$12$

Significance level : $\alpha=1-0.95=0.05$

Critical value : $z_{\alpha/2}=1.96$

We know that the confidence interval for population mean is given by :-

$\mu\pm z_{\alpha/2}\dfrac{\sigma}{\sqrt{n}}$

$109.33\pm(1.96)\dfrac{12}{\sqrt{60}}\\\\\approx109.33\ \pm\ 3.04\\\\\approx(109.33-3.04,\ 109.33+3.04)\\\\(106.29,\ 112.37)$

Hence, the 95% confidence interval for the mean amount spent per owner for an obedience class will be $(\$106.29,\ \$112.37)$

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3 years ago

Which of the following ordered pairs is a solution of 2x-y=-9?

Ann [662]

Answer:

(4,-1)

Step-by-step explanation:

3 0

3 years ago

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If the area is 1 then what is the side length of a square?

Aleksandr [31]

The side length of the square is also 1.

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3 years ago

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FINND X AND Y PLS LOL ILL MARK BRAINILEST DONT GUESS THO<br> -2x + 5y = 60<br> x + 5y = 45

Katen [24]

Answer:

(-5, 10)

Step-by-step explanation:

I used the substitution method.

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3 years ago