P=q/r
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The correct answer is P = k*q/r where k is the constant of proportionality.
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q = k*r^3/(s*sqrt(t))
If P varies directly with q, r and s then P = kqrs, where k is a constant. As 70 = k x 7 x 5 x 4 = 140k : k = 70/140 = 1/2 The equation of joint variation is P = ½qrs.
q + p
If p then q is represented as p -> q Negation of "if p then q" is represented as ~(p -> q)
p-q