exam Maths Puzzle Numerical Ability

I am a little confused, can someone help me?

LCM of 3(y-7)and 21(y-7)

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exam Other Question

Find the time required for an object to fall to the ground from a guilding that is 1400 ft. high using

t = 1/4 with the square root of s
write equation in standard form?

y-7=4(x+4)