1. A tank has 25 gallons of chemicals in it. Chemicals were added to the tank at a rate of 7
gallons per second. Which equation models the relationship between t the number of
gallons of chemicals, and w, the number of seconds chemicals are being added to the
tank?
A T = 25w +7
B. T= 32W
C. T=W + 32
D. T = 7w + 25

D. T = 7w + 25

Step-by-step explanation:

There is already 25 gallons of chemicals in the tank. Any further chemicals being put in would add on to that 25 gallons. If 7 gallons per second are going into the tank then the expression would be T = 7w + 25

the solution is 12x-6y

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0