Solve each system using substitution.
-x^2-x+19=y
x=y+80

Which graph corresponds to the function f(x) = x2 + 4x – 1?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.