book Maths Puzzle Numerical Ability

can you help me with thequation, formula, & inequality
1) y/9=7

2) y/9+5=0

3) Given the formula K=LMN, what is the formula for M?

4) 3p-16<20.

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book Other Question

Your help is appreciated.

Convert equation of the parabola y = -6x^2-6x to standard form and then find the product a x h x k.

Thank you. a group of 80 people attended a ball game. There were three times as many children as adults in the group. How many children were in the group?