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3 years ago

13

I NEED HELP ASAP!!!!!!!!!

1 answer:

maria [59]3 years ago

8 0

Answer:

a=81.0

there ya go

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PLEASE HELP!!! BRAINLIEST!!!

Rashid [163]

Melissa is standing 40 ft from a tree, so m = 40 is base of the triangle.
angle of elevation (aoe) = 50°
The tree's height (h) is the side opposite the aoe (50°), therefore in trigonometry tangent 50 = opposite / adjacent. The side adjacent to that angle (50°) is the base (m). Therefore:
tan50 = h/m
And now h = m (tan50)
h = 40 (1.19) = 47.7 ft

3 0

4 years ago

Find the mean of the calories burned in the activities listed in the table.

lilavasa [31]

487.2

Find mean by adding all numbers together and then dividing by the number of numbers

5 0

3 years ago

Will Give Brainliest if Correct

Nata [24]

Answer:

(a) 0

(b) -3/26

Step-by-step explanation:

(a)

We essentially plug 1 in for x and 2 in for y.

Our expression is $\frac{2x-y}{y^2+1}$ , so making the correct substitutions yields:

$\frac{2x-y}{y^2+1}=\frac{2*1-2}{2^2+1}=\frac{2-2}{4+1} =\frac{0}{5} =0$

So, the answer for part (a) is 0.

(b)

Again, we're now plugging in 1 for x and 5 for y:

$\frac{2x-y}{y^2+1}=\frac{2*1-5}{5^2+1}=\frac{2-5}{25+1} =\frac{-3}{26} =-\frac{3}{26}$

So, the answer for part (b) is -3/26.

7 0

4 years ago

Read 2 more answers

Leni [432]

<h2>Answer : (2.67, 3.53)</h2><h2></h2>

Step to step explanation:

Confidence interval for mean, when population standard deviation is unknown:

$\overline{x}\pm t_{\alpha/2}\dfrac{s}{\sqrt{n}}$

, where $\overline{x}$ = sample mean

n= sample size

s= sample standard deviation

$t_{\alpha/2}$ = Critical t-value for n-1 degrees of freedom

We assume the family size is normal distributed.

Given, n= 31 , $\overline{x}=3.1$ , s= 1.42 ,

$\alpha=1-0.9=0.10$

Critical t value for $\alpha/2=0.05$ and degree of 30 freedom

$t_{\alpha/2}$ = 1.697 [By t-table]

The required confidence interval:

$3.1\pm ( 1.697)\dfrac{1.42}{\sqrt{31}}\\\\=3.1\pm0.4328\\\\=(3.1-0.4328,\ 3.1+0.4328)=(2.6672,\ 3.5328)\approx(2.67,\ 3.53)$

Hence, the 90% confidence interval for the estimate = (2.67, 3.53)

6 0

3 years ago

PLEASE HELP The length of a side of a square is √7 cm. What is the area of the square? (Area = length times width)

padilas [110]

Area of square = side × side =7

8 0

3 years ago