Lizzie buys 8 books and pays with a $50 dallor bill.
alex buys 3 books and pays with a $20 dallor bill.
lizzie and alex both get the same amount of change. how much dose one book cost?

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 p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

Corresponding angles are a. always b. sometimes c. never congruent