The area of a circle is 40cm. Calculate the circumference of the circle.

i already know the answer since its in the markscheme but there's no solutions provided, so please show your working out for brainliest :)

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The graph shown is the graph of which function?

Aroulette wheel has 38 slots in which the ball can land. two of the slots are green, 18 are red, and 18 are black. the ball is equally likely to land in any slot. the roulette wheel is going to be spun twice, and the outcomes of the two spins are independent.the probability that it lands one time on red and another time on black in any order is(a) 0.5 (b) 0.25 (c) 0.4488 (d) 0.2244