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BigorU [14]
3 years ago
11

4.

Mathematics
1 answer:
marusya05 [52]3 years ago
4 0

Answer:

a) 36

b) 8.5

c) 5/2

d) 6

e) 9

f) 8

Step-by-step explanation:

a) x \div 3 =12

Multiply both sides by 3

x \div 3 =12\\3*(x \div 3) = 12*3\\x=36

b) 2x+3=20

Subtracting 3 from both sides

2x+3-3=20-3\\2x=20-3\\2x=17\\x=\frac{17}{2}\\x=8.5

c) \frac{4}{3}x=\frac{10}{3}

Multiply both sides by 3/4

\frac{4}{3}x*\frac{3}{4} =\frac{10}{3}  *\frac{3}{4}\\x=\frac{5}{2}

d) -4x=-24

Divide both sides by -4

-4x=-24\\\frac{-4x}{-4}=\frac{-24}{-4}\\x=6

e) 2(x-4)=10

Divide both sides by 2

2(x-4)=10\\\frac{2(x-4)}{2}=\frac{10}{2}\\x-4=5\\Adding \ 4 \ on \ both \ sides\\x-4+4=5+4\\x=9

f) -0.5x+1.1=-2.9

Subtracting 1.1 on both sides

-0.5x+1.1-1.1=-2.9-1.1\\-0.5x=-4\\Divide \ both \ sides \ by \ -0.5\\\frac{-0.5x}{-0.5}=\frac{-4}{-0.5}\\x=8

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