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3 years ago

Simplify the expression: 2h+7+6+2h2

Mathematics

2 answers:

Alekssandra [29.7K]3 years ago

8 0

2h2+2h+13 I believe!!!!

lions [1.4K]3 years ago

4 0

Answer:

Step-by-step explanation: 2h+7+6+ $2h^{2}$

2ℎ2+2ℎ+13

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On percent error, if 48% is the actual and the error rate is 20%, what is the estimate?

alex41 [277]

The estimate is 57.6 %

Solution:

Given that, On percent error, 48% is the actual and the error rate is 20%

To find: Estimate

Percent error is the difference between a measured and known value, divided by the known value, multiplied by 100%

The formula for percent error is given as:

$\text { percent error }=\frac{\text {estimated value}-\text {actual value}}{\text {actual value}} \times 100$

Here given that,

percent error = 20 %

Actual = 48 %

Estimate = ?

Let "x" be the estimate

Substituting the values we get,

$20 = \frac{x-48}{48} \times 100\\\\20 \times 48 = (x-48) \times 100\\\\960 = x - 48 \times 100\\\\x - 48 = \frac{960}{100}\\\\x - 48 = 9.6\\\\x = 48 + 9.6\\\\x = 57.6$

Thus the estimate is 57.6 %

8 0

3 years ago

What is the measure of a vertex angle of an isosceles triangle if the measure of one of its base is 45?

Afina-wow [57]

I’m trying to get points so I’m not answering this

6 0

3 years ago

EVALUATE (-10)² PLEASE SHOW UR WORK THXS

Natalka [10]

The answer is either: (im making you choose)

-100
or
100

You multiply -10 by itself to get the correct answer
Dont forget about the signs

3 0

3 years ago

Read 2 more answers

A random sample of 4000 college students yielded 2250 who are in favor of banning Hawaiian shirts. Estimate the true proportion

Andreas93 [3]

Answer: (0.5496, 0.5754)

Step-by-step explanation:

The confidence interval for population proportion (p) is given by :-

$\hat{p}\pm z*\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$ , where $\hat{p}$ = Sample proportion , n= sample size , z*= Critical z-value.

Let p be the proportion of all college students who are in favor of banning Hawaiian shirt.

Given, A random sample of 4000 college students yielded 2250 who are in favor of banning Hawaiian shirts.

i.e. n=4000

$\hat{p}=\dfrac{2250}{4000}=0.5625$

z-value for 90% confidence level is 1.645

Now , 90% confidence interval for p would be :

$0.5625\pm (1.645)(\sqrt{\dfrac{0.5625(1-0.5625)}{4000}})$

$=0.5625\pm (1.645)(\sqrt{0.0000615234375})\\\\=0.5625\pm (1.645)(0.00784368774876)\\\\\approx0.5625\pm0.0129\\\\=(0.5625-0.0129, \ 0.5625+0.0129)\\\\=(0.5496,\ 0.5754)$

Hence, the required 90% interval = (0.5496, 0.5754)

6 0

4 years ago

A cell phone tower in a field casts a shadow of 100 ft. At the same time, a 4 ft 6 in post near the tower casts a shadow of 3 ft

Volgvan

This is the concept of linear proportionality;
We are required to find the height of the tower in feet. The height of the tower will be found as follows;
[height of tower]/[length of the shadow of tower]=[height of post]/[length of shadow of the post]
height of the tower =h
height of the shadow=100ft
height of post=4 ft 6in=4 1/2 ft= 9/2 ft
length of the post's shadow=3 ft 4 in 3 1/3 ft=10/3 ft

N/B 1 ft= 12 inches

thus;
h/100=(9/2)/(10/3)
multiplying both sides by 100 we get:
h=(9/2)/(10/3)*100
h=9/2*3/10*100
h=135 ft

the answer is 135 ft

3 0

4 years ago