Write each percent increase or decrease as a percentage of the inital amount. ( i. e a new cereal 20% more cereal than the old one is 120% of the original.)

This year there were 25% fewer sunny days than last year.

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0