How many blocks do you need to add to square 6 to get 7? to square 9 to get square 10? to square 19 to get square 20? explain

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad