exam Maths Puzzle Numerical Ability

A projectile is launched upward from the ground level with an initial speed of 98m/s. How high will it go? When will it return to the ground?

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step 1: The parabola opens up because a>0
step 2: find the vertex (2,1)
step 3: find x-intercepts:
0=(x-2)^2 + 1
(x-2)^2 = -1
x-2 = square root of -1
x=2+/-i
The equation ha
Assume that x is a positive number.
Use the logarithm properties to present the expression:

log(x + 5) - log x

as the logarithm of a single quantity.