What is the sign of 3xy when x > 0 and y < 0?

answer:

let see.

numbers which are bigger than 0 are defined as positive numbers and have a prefix of + (plus).

numbers which are smaller than 0 are defined as negative numbers and have a prefix of - (minus).

let say number a is equal to the expression,

a=3xy

since y is negative we can change its prefix to -,

a=3x\cdot(-y)

any number (in this case 3x) multiplied by negative number will produce a negative number.

therefore the sign or prefix of number a will be -.

hope this .

r3t40

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.