Iwill give ! part a: if m1 = 53, what is m3? part b: derrick states that def is an isosceles triangle. is derrick correct? explain.

A . 143 degrees

B.  Not isosceles.

Step-by-step explanation:

A.

m < 3 = 90 + m < 1    (by the external angle of triangle theorem)

= 90 + 53

= 143

B. If DEF is an isosceles m < 1 = m <2

and m < 2 = (180 -  143)            (adjacent angles are supplementary).

= 37 degrees but m<1 = 53 degrees so it is not isosceles.

answer: it would most likely be y=6 and 5/7.

step-by-step explanation:

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.