The point A(7,4) is dilated from the origin by a scale factor r=3. What are the coordinates of point A'?

2.30+0.4-0.88+1.33 can u explain the answer to this why the answer is 3.15

What is the length of bc ? enter your answer in the box. bc =

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)