30 points

what is the value of y?

enter your answer in the box.

y =

Step-by-step explanation:

Because of the Isosceles Triangle Theorem, angle B and angle C have the same measure.  If angle B is 75, then so is angle C.  By the Triangle Angle-Sum Theorem, all the angles of a triangle have to add up to equal 180 degrees.  That means that angle A = 180 - 75 - 75 which is 30 degrees.  Therefore,

Angle A = 30 degrees.   By the substitution property of equality,

4y + 10 = 30 and

4y = 20 so

y = 5

3.how is solving radical equations different than solving linear equations?

step-by-step explanation:

answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.