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Vikki [24]
3 years ago
6

Somebody please help me

Mathematics
1 answer:
Tamiku [17]3 years ago
5 0

Answer:

382.5 square inches

Step-by-step explanation:

The surface area of a 3D object is the sum of the area of all of the surfaces. Therefore, the surface area of this prism is:

9\cdot 13.5 + 2(\dfrac{1}{2} \cdot 10\cdot 9)+ 9\cdot 9 + 10\cdot 9= 382.5 square inches.

Hope this helps!

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Round 287.9412 to the nearest tenth
Neporo4naja [7]

The answer is 287.9 I believe (sorry if it's wrong)

6 0
4 years ago
Passing through(-1,8) and parallel to the line whose equation is 8x-9y-2=0
notka56 [123]
<h3>Answer:</h3>

y = 8/9x + 80/9

<h3>Step-by-step explanation:</h3>

<u>We are given;</u>

  • Equation of a line as 8x -9y -2 = 0
  • Coordinates (-1,8)

We are required to determine the equation of a line parallel to the given line and passing through a point (-1,8)

<h3>Step 1: Determine the Gradient of the given line </h3>
  • When an equation is written in the form y = mx + c, m is the gradient.
  • Therefore; we could write the equation 8x -9y -2 = 0 in the form of  y= mx + c

9y = 8x -2

y = 8/9x - 2/9

Therefore, the slope, m = 8/9

<h3>Step 2: Determine the equation of the line</h3>
  • We need to know that parallel lines have the same gradient
  • Therefore, the slope of the line in question is 8/9
  • It passes through a point (-1, 8)

We can therefore, determine the equation;

Taking another point, (x,y)

\frac{y-8}{x+1} = \frac{8}{9}

9(y-8) = 8(x+1)

9y - 72 = 8x + 8

 9y = 8x + 8 +72

 9y = 8x + 80

  y = 8/9x + 80/9

Therefore, the equation of the line is y = 8/9x + 80/9

4 0
4 years ago
Complete the table, y= 7/8x-1
Fofino [41]

Answer:

1. y = -11/4; (-2, -11/4)

2. y = -1; (0, -1)

3. y = -1/8; (1, -1/8)

4. y = 0; (8/7, 0)

5. y = 3/4; (2, 3/4)

Step-by-step explanation:

4 0
3 years ago
Evaluate the sum of the following finite geometric series.<br> 5+15+45 +135+ . . . + 1215<br> Sn=1
Nata [24]

Answer:

1820

Step-by-step explanation:

The sum of the first n terms of a geometric series with common ratio r and first term a is:

a(1-r^n)/(1-r). Plugging this in 5(1-3^6)/(1-3)=1820

5 0
3 years ago
The difference of a number and ninety when a=102
WINSTONCH [101]

Answer:

It should be 12, assuming that a is a variable.

Step-by-step explanation:

a = 102

a - 90 = ?

102 - 90 = 12

Hope this helps.

8 0
3 years ago
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