exam Maths Puzzle Numerical Ability

can you please assist me solving the problem...instructions...

a triangle has sides 3x + 7, 4x - 9, and 5x + 6. find the polynomial that represents its perimeter.

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exam Other Question

1. How are addition and multiplication used to solve a linear equation? Demonstrate by solving "15x + 7 = 31 + 3x"

2. Translate the following into a system of equations, th If ship is anchored at origin of 3 dim. coordinate sys. and 2 probes are sent below the surface, 1st probe stops at (-8, -4, 6) and 2nd probe stops at
(4, -9, -2) which probe is farather from the ship?