1.3 The family uses pre-paid electricity which is charged at R1.11 per kWh and the
first 50 units are free.
1.3.1 Determine the formula that can be used to calculate the total
cost of electricity.
1.3.2
The family uses 300 kWh of electricity per month, use the formula in
Question 1.3.1 to calculate the total cost of electricity used.
Rico
21 x 15/15
= 15
(3)
4
ed
Please turn over

Given the function f(x) = 3x + 1, evaluate f(a + 1). a. 3a + 1 b. a + 2 c. 3a + 4

Solve the system of equations. y= 2x y= x^2 - 15

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)