Is there anyone that can help me with this Algebra assignment on POLYNOMIALS? PLEASE ITS DUE IN A FEW HOURS!?

Question

3. Solve the following:

vii. -2x = 3x + 4

viii. 3x/4 = 6

ix. y/6 + 1 = 9

x. 6 = -2x/4

xi. Find f(1) for f(x) = 4x3 - 3x2 - x + 2

xii. A function gives the value of C as 2 × (22/7) × r. Find C when r = 21 cm and r = 84 cm.

Answer 1

vii)

-2x = 3x + 4

-2x - 3x = 4

-5x = 4

x = -4 / 5

viii)

3x/4 = 6

3x = 6 * 4

x  = 24 / 3

x = 8

ix)

y/6 + 1 = 9

y/6 = 9-1

y = 8 * 6

y = 48

x)

6 = -2x/4

6 * 4 = -2x

24 / -2 = x

x = -12

xi)

f(1) = 4(1)3 - 3(1)2 - 1 + 2

f(1) = 12 - 6 - 1 + 2

f(1) = 14 - 7

f(1) = 7

xii)

2 * (22/7) * r = c

2 * (22/7) * 21 = c

42 * (22/7) = c

6 * 22 = c

c = 132 cm   when r = 21 cm

2 * (22/7) * r = c

2 * (22/7) * 84 = c

168 * (22/7) = c

c = 528 cm when r is 84 cm