Kindly any mathematician assist me do that question am giving the brainliest

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Which statement justifies why angle ebc measures 90?

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.