The product of the slopes of two non-vertical perpendicular lines is always -1. it is not possible for two perpendicular lines to both have a positive slope because the product of two positives is positive. so for the product of the slopes to be -1, one of the slopes must be positive and the other negative.

is this true or false?

It is true.

Step-by-step explanation:

For example:

If the slope of a line "A" is 3/4 and it is perpendicular to a line "B", then the slope of the line B must be -4/3, because the slope of perpendicular lines are opposite reciprocal.

If you multiply this slopes, you obtain:

Therefore, keeping the explanation above on mind, the answer is: True.

47.28 or 47.2857143

step-by-step explanation:

you just divide 331 by 7 and you get that answer. ( i think so tho)

m∠a is 90°

m∠b is 40°