X+3 and 2x are they equivalent expressions

no

Step-by-step explanation:  well first off 2 and 3 are not the same number and X+3 would be 3X and that is not the same as 2X

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

the aswere is the one with all 8's and the second one is with the 10,8 and 6

step-by-step explanation: