exam Maths Puzzle Numerical Ability

Given that u(t)=2tē-1, find the expression for u(3t)-2u(t)

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exam Other Question

The line passes through the points (-3,4) and (7,-2). I have

m=4-(-2)/-3-7 = 6/10 = 3/5
i need to find the number of square yards of sod needed to cover the circular putting green shown
(hint:9sq ft= 1 sq yd)

the circle has a radius of 15 ft