One hundred eighty is equal to how many tens

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

If (17, 4) is an ordered pair of the inverse of f(x), which of the following is an ordered pair of the function f(x)? a. (17,4) b. (4.17) c. (4,0) d. 0,17)

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c