Jeremy can type 220 words in 4 minutes what is the unit rate and what does mean and to your answers in the box

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )