exam Maths Puzzle Numerical Ability

i dont understand how to (9) which of the following has the same vale as -2(-7) or how to evalute 4-6 over 2 ...please explain throughly...

Read Solution (Total 0)

exam Other Question

given: line segment gj is the perpendicular bisector of line segment hk.
Prove triangle ghm is congruent to triangle gkm.

this is a proof please help
Multiply:
(5√[2] + 3)(√[2] – 2√[3])