Describe and correct the error in finding the distance between the points (−3 −2) and (7 4)

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.

Maria heard on the radio that the high temperature that day would be to determine the temperature in degrees celsius, she used the formula , where c is the temperature in degrees celsius and f is the temperature in degrees fahrenheit.

I’m confused because i this angle is less than 180 degrees but more than 90 degrees am i just totally wrong. i don’t know i’m confused. plz explain. thx