Answer:
Step-by-step explanation:
square of 15 + square of x = square of 21
225 + square of x = 441
441 - 225 = 216
x = 216
Answer: 1.) x - 2y = 4 , add 2y to both sides. ---> answer is, X = 2y + 4
2.) 2x - 6y = 8, Add 6y to both sides, then divide both sides by 2. --> answer is, X = 3y + 4
Answer:
<h2>x > 3+y</h2>
Step-by-step explanation:

OMG I HAD THIS EXACT HOMEWORK LAST YEAR CREEPYYYYY!!!!
A is proportional
B is not
C is proportional I think