During 30 minutes on the treadmill the toilet bring 20 cal per minute what is the rate of change of a function that represents this situation

Which graph represents the following piecewise defined function?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11

Compound inequalities. , i’m being timed