Which vectors represent the reflection of the vector <3,-7> across the x-axis [-3, 7]
<-3,7>
[3, 7]
[7, -3]
<3,7>
<7,-3>

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.

Write a ratio and a percent for the shaded area. it is 3x3 and 5x5 grid there is 6 shaded out of a. 6 over 25 , 30% b. 3 over 50 , 6% c.6 over 25 , 24% d. 3 over 10 , 30%

What is the measure of dg? enter your answer in the box.