The sum of 54 and 4 times a number is 21, find the number please helppp

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Which point has an coordinates of (2,0) ? a