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3 years ago

Help please ASAP thanks!

Mathematics

2 answers:

ludmilkaskok [199]3 years ago

7 0

A. 55%
because you have to add 21 and 45 then you divide the answer -66- by how much 2 hours is in minutes. The you get 0.55, so it equals 55%

Mandarinka [93]3 years ago

4 0

2 hours is 120 minutes.
If you take 21 divided by 120 mutiplied by 100 that gives you 17.5% of stretching
Then you take 45 divided by 120 multiplied by 100 that gives you 37.5% of jogging
100-17.5=82.5
82.5-37.5=45

b) 45%

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The area of a triangle is 36 4/5 units squared and the height of the triangle 9 1/5 what is the length of the triangles base

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Answer:

Height = 8 units

Step-by-step explanation:

Area of a triangle = $36\frac{4}{5}$ square units

= $\frac{184}{5}$ square units

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= $\frac{46}{5}$ units

Formula to calculate the area of a triangle is,

Area = $\frac{1}{2}(\text{Base})(\text{Height})$

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$\frac{184}{5}= (\frac{46}{10})\times (\text{Height})$

Height = $\frac{184}{5}\times \frac{10}{46}$

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2 years ago

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Answer:

1 pound or 3/3

Step-by-step explanation:

Subtract the green peppers from the total (5/3 - 2/3 = 3/3)

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3 years ago

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Solve the following systems of equations 2a+4b+c=5 ; a-4b=-6 ; 2b+c=7.

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Answer:

a = -2

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Step-by-step explanation:

Given:

2a + 4b + c = 5 ............(1)

a - 4b = - 6

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2b + c = 7

c = 7 - 2b ...........(3)

substituting 2 and 3 in 1, we get

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2 years ago

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Answer:

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Step-by-step explanation:

1) Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

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Since the new Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.05,0,1)".And we see that $z_{\alpha/2}=1.64$