What is the solution set of the following quadratic equation?
x2 = -6x +7
a.{1, -7}
b. {-1, -7}
c. {1,7}
d.{-1, 7}

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no