The cost c of petrol is directly proportional to the number of litres L. 8 litres of petrol cost £10.
a Find the formula connecting cost c of petrol and number of L.
b Work out the cost of 50 litres of petrol​

The equation represents the function f, and the graph represents the function g. f(x)=3(5/2)^x determine the relationship between the growth factors of f and g. a. the growth factor of g is twice the growth factor of f. b. the growth factor of f is twice the growth factor of g. c. the growth factor of f is 2.5 times the growth factor of g. d. the growth factor of f is the same as the growth factor of g.