The perimeter of the top of a desk is 54 inches if the length of the desk is 15 inches what is the width of the desk

Idont get this question can someone me solve it? ** the distance light travels in one second (1 light second) is about 1.86 ×10^5 mi. saturn is about 475 light-seconds from the sun. about how many miles from the sun is saturn..my guess is 8.83* 10^7 you so much

Asap 25 pts + brainliest to right/best answer

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps