Which product will be negative?

7*(-9)

Step-by-step explanation:

Here's a simple rule to follow.

pos*neg=neg

neg*neg=pos

pos*pos=pos

Based on this, we can determine that the first option will yield a negative product. The other options are either multiplying two positive integers, or two negative one.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse