Use the equation of -b/2a, so if you have a line you can just plug in the numbers.
we know that
In the right triangle ABC
∠
∠
------> by complementary angles
so
Step 
Find the measure of angle B
we know that

in this problem

so

Step 
Find the measure of angle A

therefore
the answer is the option
35.5° and 54.5°
Ok so what we have to do is 4+7+9=c
4+7=11
11+9=20
c=20
your answer is 20
Answer:
where is the following
Step-by-step explanation:
b i can teve n tse the following answers