Answer:
10.22
Step-by-step explanation:
2.45 * 10 =20.45 - 3.67 * 10 =30.67
30.67 - 20.45
30 - 20 = 10
.67 - .45 = .22
30.67 - 20.45 = 10.22
x=15
21:2x=7:10 can be rewritten as 21/2x=7/10
21/2x=7/10, cross multiply
= 14x=210
7a........they are similar because none of the sides are equal