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3 years ago

Pleas help me it hard for me

Mathematics

1 answer:

Anon25 [30]3 years ago

3 0

Answer:

Step-by-step explanation:

The area of the rectangle is 3x(2x+5)=6x^2 + 15x

The are of the triangle is 2(x-3)/2 = x-3

Now subtract the triangle are from the rectangles area

6x^2 + 15x - x + 3 = 6x^2 + 14x + 3

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Does anyone know the answers to these?

dem82 [27]

Step-by-step explanation:

a. The point estimate is the mean, 47 days.

b. The margin of error is the critical value times the standard error.

At 31 degrees of freedom and 98% confidence, t = 2.453.

The margin of error is therefore:

MoE = 2.453 × 10.2 / √32

MoE = 4.42

c. The confidence interval is:

CI = 47 ± 4.42

CI = (42.58, 51.42)

d. We can conclude with 98% confidence that the true mean is between 42.58 days and 51.42 days.

e. We can reduce the margin of error by either increasing the sample size, or using a lower confidence level.

3 0

3 years ago

PLEASE HELP! WILL GIVE 70 POINTS!!

Tresset [83]

Answer:

$A=189\ mm^2$

Step-by-step explanation:

<u>Surface Areas </u>

Is the sum of all the lateral areas of a given solid. We need to compute the total surface area of the given prism. It has 5 sides, two of them are equal (top and bottom areas) and the rest are rectangles.

Computing the top and bottom areas. They form a right triangle whose legs are 4.5 mm and 6 mm. The area of both triangles is

$\displaystyle A_t=2*\frac{b.h}{2}=b.h=(4.5)(6)=27 mm^2$

The front area is a rectangle of dimensions 7.7 mm and 9 mm, thus

$A_f=b.h=(7.5)(9)=67.5 \ mm^2$

The back left area is another rectangle of 4.5 mm by 9 mm

$A_l=b.h=(4.5)(9)=40.5 \ mm^2$

Finally, the back right area is a rectangle of 6 mm by 9 mm

$A_r=b.h=(6)(9)=54 \ mm^2$

Thus, the total surface area of the prism is

$A=A_t+A_f+A_l+A_r=27+67.5+40.5+54=189\ mm^2$

$\boxed{A=189\ mm^2}$

4 0

3 years ago

The sum of three consecutive multiples"<br>of 8 is 192. Find the multiples.

goblinko [34]

Answer:

7,8,9

Step-by-step explanation:

192/8=24

X+(x+1)+(x+2)=24

3x+3=24

3x=21

x=7

so it’s 7,8,9

8 0

3 years ago

Read 2 more answers

ITS EASY PLS HELP!!!!!

faust18 [17]

Answer:

3/18

Step-by-step explanation:

5 0

3 years ago

What would be the total area of a piece of land that was made up of three squares that each has a side length of 4x-2?

Darya [45]

Answer:

48x^2-48x+12

Step-by-step explanation:

3(area of square)

3(w^2)

3((4x-2)^2)

3(16x^2-16x+4)

48x^2-48x+12

4 0

4 years ago