exam Maths Puzzle Numerical Ability

I'm not sure how to solve these problems:
-7(√18)-5(√200)-3(√162)

7x^3/7
My Work:
(^7√7x)^3= x^3?

(√p^2-5p+9)= p-2
My Work:
(√p^2-5p

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exam Other Question
write the linear equation in standard form that is parallel to the x-axis and having a y-intercept of -4 If soccer ball kicked straight up from the ground with an initial velocity of 32 feet per second, then its height above the earth in feet is given by
s(t)= -16t^2+32t where t is