exam Maths Puzzle Numerical Ability

What is the LCM for the following
15b^8a^5, 3b^8a^7, 10b^7a^2

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exam Other Question

Two cyclists, 91 mi apart, start riding towards each other at the same time. One cycles just as fast as the other. If they meet 3 hr later, at what average speed is each cyclist traveling? apply the quadratic formula to find the roots of the given function, and then graph the function.
f(x) = x2 + 4
g(x) = x2 + x + 12