Question

Please help me with 15 and 16.

Answer 1

15.

`3x-5+2x=90\\ 5x=95\\ x=19`

16.

`\$38.85-\$6=\$32.85\leftarrow\text{this much they spent without the tip}\\ \$32.85/3=\$10.95\leftarrow\text{this much paid each of them}\\ \$10.95+\$2=\$12.95\leftarrow\text{this is the regular price}\\`