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kolezko [41]
2 years ago
11

Can someone just explain to me how to do this please

Mathematics
1 answer:
Dmitrij [34]2 years ago
5 0

Answer: -7.5

Step-by-step explanation:

area = 1/2bh.

area = 1/2(x+6)(5)

area = x/2 + 15

area = x/2 = -15

area = x = -7.5

area = -7.5

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What are the opposites of 5, −2.6, 2.25, and 7 1 4 ? Enter the answers in respective order, each separated by comma.
arsen [322]
-5, 2.6, -2.25,and -714
7 0
3 years ago
Find the real solutions of the equati<br> √7x+1 - √x-5 = 6
Juliette [100K]

The solution of this equation is x = 5 and   x = 9.

<h3>What is the solution?</h3>

Let us recall that what we have here is a radical equation as follows;

√7x+1 - √x-5 = 6

When we isolate we have';

 √7x+1 = √x-5+6

Taking the square of both sides;

  (√7x+1)^2 = (√x-5+6)^2

Hence;

    7x+1 = x-5+36+12√x-5

-12√x-5 = -7x-1+x-5+36

12√x-5 = 6x-30

Raising this equation to power 2

144x-720 = 36x^2-360x+900

When we rearrange we obtain;

36x2  - 504x  + 1620 = 0

Hence;

x = 5 and   x = 9

Learn more about radical equation:brainly.com/question/8606917

#SPJ1

5 0
1 year ago
Does anyone know a quick method to divide a whole number with a decimal
alina1380 [7]
<h2>Answer_use this method </h2>

d =  \frac{d(10 {}^{k + p}  - 10 {}^{k}) }{(10 {}^{k + p}  - 10 {}^{k})}

where

  • d=is the given decimal
  • k=is the number of terminating digits
  • p=is the number of repeating digits

Step-by-step explanation:

Greetings !

use the above formula to change any decimal into fraction form

Thus, plug in the value and solve

Hope it helps !

8 0
2 years ago
The mean of 8 math quiz scores is 88. If the first seven scores are 85,70,92,85,91,100, and 88, what is the eighth quiz score? U
777dan777 [17]

Answer:

93

Step-by-step explanation:

The mean of a list of numbers is the sum of the numbers divided by the count of the numbers in the list.

In this case, representing the eighth score with x, the mean is (611+x)/8

Solving for the mean:

88=(611+x)/8

Multiply both sides by 8

8*88=611+x

704=611+x

704-611=x

x=93

3 0
3 years ago
Read 2 more answers
Solve for x math question
Colt1911 [192]

Square both sides

9(x + 2) = x + 4

Expand

9x + 18 = x + 4

Subtract x from both sides

9x + 18 - x = 4

Simplify 9x + 18 - x to 8x + 18

8x + 18 = 4

Subtract 18 from both sides

8x = 4 - 18

Simplify 4 - 18 to -14

8x = -14

Divide both sides by 8

x = -14/8

Simplify 14/8 to 7/4

<u>C. x = -7/4</u>

8 0
3 years ago
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