book Maths Puzzle Numerical Ability

simplify

(-3s)(4p)+(-4s)(3p)

Thank you

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book Other Question

A store currently charges the same price for each towel that it sells. If the current price of each towel were to be increased by $1, 10 fewer of the towels could be bought for $12 My question says to solve the system of this inequalitie by graphing.
y<x+1
y>-x+5

I dont know how to solve this or graph it. could you help me?
thanks