Solve the following systems of equations using substitution.
a. 2x + 4y = 48
Y=2x-11

b. x = y-3
- 5y + x = -51

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

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?

Find the amplitude of a sinusoidal function that models this temperature variation