Evaluate expression
a) -19 + 3(-13 + 4*3)

b) | -7(2) |

c) 15 – 3 | - 4-2 |

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

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?