The center of a circle is at (−3, 1) and its radius is 9. what is the equation of the circle?
a.) (x+3)2+(y−1)2=81
b.) (x−3)2+(y+1)2=18
c.) (x−3)2+(y+1)2=81
d.) (x+3)2+(y−1)2=18

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Sketch the vector field vector f( vector r ) = 8vector r in the xy-plane. select all that apply. the length of each vector is 8. the lengths of the vectors decrease as you move away from the origin. all the vectors point away from the origin. all the vectors point in the same direction. all the vectors point towards the origin. the lengths of the vectors increase as you move away from the origin.