Question

1. A car bought for $20,000. Its value depreciates by 10% each year for 3 years. What is the car's worth after3 years?

2. Find the perimeter of a circle whose radius is 3.5cm. (Take pi = 22/7)

3. The volume of a cone is 1540cm³. If its radius is 7cm, calculate the height of the cone. (Take pi = 22/7)
4. What is the coefficient of b in the expression b² - 5b +18
5. Expand (x +2) (9 - x)

7. Find x and y in the simultaneous equations. x + y = 4 3x + y = 8
8. Factorize a² +3ab - 5ab - 15b²
9. The bearing of a staff room from the assembly ground is 195degrees, what is the bearing of the assembly ground from the staff room?

Answer 1

Answer: 5. -x^2 + 7x + 18

Step-by-step explanation:

(x+2)(9-x)
= 9x - x^2 + 18 - 2x
= -x^2 + 7x + 18

Answer 2

Step-by-step explanation:

68$53++83(-$(7(3($++$