What is the height of this triangle? We have a triangle with sides 50, 70 and 80 and have drawn an altitude ('h') to side AB. We have segmented side AB into "x" and "80-x".
From the Pythagorean Theorem, we know that
h^2 = 50^2 - x^2 and that h^2 = 70^2 - (80 -x)^2
Both equations = h^2 so we can make a new equation
50^2 - x^2 = 70^2 - (80 -x)^2 which equals
2,500 -x^2 = 4,900 -6400 +160x -x^2
4,000 -x^2 = 160x -x^2
-2x^2 -160x +4,000 = 0

d is correct

step-by-step explanation:

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

c

step-by-step explanation: