Grade 8 math questions? I'm not asking you to do my homework, just need help?

Question

B) SUBSTITUTING
a = 1/8
b= 12

1 + 2a - 3/2b

Answer 1

1 + 2a - 3/2b

Substitute a = 1/8 and b = 12 in the form.

1 + 2(1/8) - 3/[2(12)]

1 + 2/8 - 3/24

1 + 1/4 - 1/8

Rewrite the expression with common denominator.

(8 + 2 - 1)/8

9/8.

Answer 2

1 + 2a - (3/2)b

Substitute a = 1/8 and b = 12 in the form.

1 + 2(1/8) - (3/2)(12)

1 + 2/8 - 36/2

1 + 1/4 - 18

Rewrite the expression with common denominator.

(4 + 1 - 72)/4

67/4.

Comments

= 1 + 1/4 - 18

Rewrite the expression with common denominator.

= (4 + 1 - 72)/4

= (5 - 72)/4

= - 67/4.