Solve for pi : c = 2 pi r. (1 point)

pi equals 2 times c over r

pi equals c over quantity 2 times r

pi equals c over r

pi equals r times c over 2

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis