book Maths Puzzle Numerical Ability

i dont understand this thank you verymu44ch

[(2+3) power of 2 -4.5}+7

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book Other Question

. Find the slope and y-intercept of -2X + 6Y = -15
A) Slope 2 and y-intercept (0,-15) B) Slope -2 and y-intercept (0,-15) C) Slope 1/3 and y-intercept (0,-15/6) D) Slope 3 and y-intercept (0,-1/3)
Sales reduction force a factory to cut back its output by 20%. By what percent must the reduced sales be increased to allow production to be brought back to normal?