15 added to 8 times a number is more than 3 times the value of 1 less than twice the number

Sal is tiling his entryway. the floor plan is drawn on a unit grid. each unit length represents 1 foot. tile costs $1.35 per square foot. how much will sal pay to tile his entryway? round your answer to the nearest cent.

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6