Evaluate a2+ab-b2+5 when a=2 and b=3

Y=25x+100 get y intercept and slope or something like that

How many gallons of fuel costing $1.15 a gallon must be mixed with a fuel costing $0.85 per gallon to get 40 gallons of a fuel that costs $1 per gallon?

The fastest has ever run is 27 miles per hour. how many miles per minutes did the human run?

Let f (x) = 5x-4 and g (x) = x^2 - 1. Find (g∘f) (-1).

How many pieces of carpet can be cut from the roll if each piece is 3/4 meter long

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.