Someone’s pls give me the answer to this!

3/10

Step-by-step explanation:

2/5 + x = 7/10

Get a common denominator of 10

2/5 * 2/2 = 4/10

4/10 +x = 7/10

Subtract 4/10 from each side

4/10 +x -4/10 = 7/10 -4/10

x = 3/10

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)