Find the value(s) of k that will cause the equation to have the given number and type of solutions. 9x2 + kx + 16 = 0, 1 real solution

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Which graph represents an even function?

What is the best estimate of the length of a football