Find the radius of a circle with area 42 square feet

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

What is the value of the discrimination for the quadratic equation 0=×2+2+×2

12 3 4 5 6 7 8 9 10 time remaining 42: 01 ryan gathered data about the age of the different dogs in his neighborhood and the length of their tails. which best describes the strength of the correlation, and what is true about the causation between the variables?