if 3x+4x+35=21, then find the value of 2x+10?

a) 6

B)-2

c)-4

d)-6

a triangle with perimeter 40 has a short side x, a middle side of 7 less than twice the shorter and a long side of 7 more than the middle side. which equation can be used to solve for x?

a) 4x=40

b) 5x-7=40

c)4x-7=40

d)5x-14=40