What times what number give you 12 but when you add those numbers give you 4

THe cost of a hamburger is $2.50. Each additional hamburger cost $2.00. Sully wrote this explicit rule to explain the sequence of costs: f (n) = 2 + 2.5 (n-1). Using the rule, he found the cost of 12 hamburgers to be 29.50. Is this number correct?

Solve for a. 4a+5=2+3.25a4a+5=2+3.25a

How do you write 9.7x10^4 (exponent 4) in standard form? A. 0.00097 B. 0.000097 C. 97,000 D. 970,000

Find the zeros of f (x) = x squared-x

Factoring 3xsquared + 14x + 20

How many numbers are between k and n?

Timothy tried to solve an equation step by step. 9 (2x+1/3) = 39

Find the inverse of y = 2x^2-8

What is the equation for as amembership fee, a health club charges a one-time amount of $40 and charges $25 for each month. The total fee after m months is $240. What is the value of?

By what number would you multiply - 3/8 (fraction) to get a product of 1?