Let $a$ and $b$ satisfy $ab=7$ and $a+b=5$. What is the value of $a^2 + b^2$? to correct answer!

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.

Find the volume of the wedge cut from the first octant by the cylinder z=12-3y^2 and the plane x+y=2.