Working with Algebra

If f = 3, g = -1 and h = 2, find the value of f² + gh

The number of bacteria N in a colony is modelled by the formula N = 2500(1 + kt) where t is the time and k is a growth factor.

(a) Find the value of N where k = 0.3 and t = 1.5

The number of bacteria N in a colony is modelled by the formula N = 2500(1 + kt) where t is the time and k is a growth factor.

(b) Write down the number of bacteria at time t = 0

The Voltage V in an electronic circuit is given by the formula V = IR. Find the value of R when V = 240 and I = 13, giving your answer to 3 significant figures