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2 years ago

Please help i dont understand

Mathematics

1 answer:

AlekseyPX2 years ago

6 0

Answer :

1) If x = 6

Substitute 6 for x in the expression.

a) 5x-9

5(6)-9

30-9

b) 2x-7

2(6) -7

12-7

c) 8x+5

8(6)+5

48+5

d) 4(x+3)

4(6+3)

4(9)

e) x²-(-4)

6²-(-4)

36+4

f) 3x²+1

3(6²)+1

3(36) +1

108+1

109

2) Solve

a) 54 = 3x

Divide both sides by 3.

54/3 = 3x/3

x = 18

b) x-9 = -3

Add 9 to both sides.

x-9+9 = -3+9

x = 6

c) x/7 = 140

Express the 140 over 1 and cross multiply.

x/7 = 140/1

x = 140×7

x = 980

d) x/8 = 72

Express the 72 over 1 and cross multiply.

x/8 =72/1

x = 72×8

x = 576

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The answer is: "2156" .
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3 years ago

The steps to convert 18 over 8 to a decimal are shown below: Division is shown with divisor 8 and quotient 2.35 and dividend 18.

natka813 [3]

Answer:

Step 2

18 over 8 to a decimal is 2.25

Step-by-step explanation:

Step 1, 20, subtract 16 labeled as

Step 2, 40 labeled as

Step 3, subtract 40, and 0 labeled as Step 4.

Divisor = 8

Divided = 18

Quotient = 2.25

2.25

8 √18

- 16

2 0

- 16

4 0

- 40

The first error is at step 2

18 over 8 to a decimal is 2.25

See the attached image for better understanding

4 0

3 years ago

How do I solve this?

Svetradugi [14.3K]

Answer: x = 15; y = 32; z = 2.5

see in the picture, u can see that this parallelogram has a right angle and two adjacent equal edges.

=> this parallelogram is a square

=> the diagonal lines of the parallelogram are perpendicular to each other

=> m∠1 = 90°

⇔ 3y - 6 = 90

⇔ 3y = 96

⇔ y = 32

because this is a square

=> 3x = 18z = 45°

=> x = 15

z = 2.5

Step-by-step explanation:

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3 years ago

Slove and I will give you a best anwser thing

olga2289 [7]

Answer:

Below:

Step-by-step explanation:

When finding the power of a power, simplify the expression by <em><u>multiplying</u></em> the exponents

$a^{m^n} =m^m^n$

12^4^-5 = $12^{4*-5$ $=12^-20=\frac{1}{12^{20}}$

$(-3)^{72}$

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3 years ago

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4 years ago

Please help i dont understand ​

Please help i dont understand