So i've gotten 3 different answers on my question "mark is 15 years younger than ashley. the sum if their ages is 55. write a system of equations to determine mark (m) age and ashley (a) age"and i just want another opinion on how to write both equation and how to solve them ! the answer i got most recently was "a-m=55 and a-15=55" which sounds right but i don't know how i'd solve for ashley or marks age

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

If you measured the width of a window in inches and then in feet with measurement would you have the greater number of units

Ahigh-altitude spherical weather balloon expands as it rises, due to the drop in atmospheric pressure. suppose that the radius r increases at the rate of 0.02 inches per second, and that r = 36 inches at time t = 0. determine the equation that models the volume v of the balloon at time t, and find the volume when t = 360 seconds. v(t) = 4π(0.02t)2; 651.44 in3 v(t) = 4π(36 + 0.02t)2; 1,694,397.14 in3 v(t) = four pi times the product of zero point zero two and t to the third power divided by three.; 4,690.37 in3 v(t) = four pi times the quantity of thirty six plus zero point zero two t to the third power divided by three.; 337,706.83 in3