Solve each equation for x.
a. x−10=0
b. x/2+20=0
c. demanding dwight insists that you give him two solutions to the following equation:
(x−10)(x/2+20)=0
can you provide him with two solutions?

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form:    science fiction books to history books 2. write the ratios as fractions:    dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Which graph represents the parent function of y=(x+2)(x-2)