Solve the system of equations using subtraction 4x - 3y = -7 4x + y=13

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

According to the 2008 u. s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Combine like terms to make a simpler expression 3z+z