Which of these shows the result of using the first equation to substitute for y in the second equation, then combining like terms? y=2x
2x+3y=16

A 8x=16
B 4x=16
C 5y=16
D 5x=16

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Find the area of the surface obtained by rotating the curve z=4e^2y from y = 0 to y =1 about the y-axis. the area is square units