One minute after takeoff, an airplane's altitude was 4,000 feet. Three minutes later, it was 20,000 feet. What was the plane's average altitude change, in feet per minute, during those three minutes?

A pencil at a stationery store costs $1, and a pen costs $1.50. Stella spent $21 at the store. She bought a total of 18 items. Which system of equations can be used to find the number of pencils (x) and pens (y) she bought? x + 18y = 21 x = 1.

A car travels 320 miles on 15 gasoline. The best estimate if the cars mile per gallon is

If f (x) = 3x - 12, what is f (2) ? O A. - 18 O B. - 6 O c. 6 O D. 18

How do you round 0.90 to the thousandths place

How many solutions 2x+4=2 (x+2) 0 1 many

Which algebraic expression is a polynomial? a.) - 6x³ + x² - √5 2 b.) 4x² - 3x + x c.) 8x² + √x?

A mixture of chlorine and water contains a total of 60 gallons. There are 30 gallons of pure Chlorine in the mixture. (I) what percent of the mixture is water? (ii) what percent of the mixture is chlorine?

What are the four terms in each sequence - 14; - 10; - 6?

There are 120 children there are twice as many boys than girls how many girls are there?

How to write 0.0658 in words?