Which statements are true regarding the system of equations? Check all that apply. 4 x + 5 y = 15. 28 x + 35 y = 105.

If a =6, what is the value of 2a(3b + 5c)?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

If the scale factor between two circles is 2x/5y what is the ratio of their areas?