<h3>
Answers:</h3><h3>
x = 12</h3><h3>
Angle B = 45 degrees</h3>
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Explanation:
Angles A and B are alternate exterior angles.
Due to the parallel lines, alternate exterior angles are congruent
A = B
5x-15 = 2x+21
5x-2x = 21+15
3x = 36
x = 36/3
x = 12
Use this x value to find the measure of angle B
angle B = 2x+21
angle B = 2*12+21
angle B = 24+21
angle B = 45 degrees
As a check,
angle A = 5x-15
angle A = 5*12+15
angle A = 60-15
angle A = 45 degrees
Since A and B are both 45 degrees, this confirms the correct x value
The Cecile factored the polynomial correctly by factor 16 x squared minus 9 using the X-method of factorization.
<h3>What is factor of polynomial?</h3>
Factor of a polynomial is the terms in linear form, which are when multiplied together, give the original polynomial equation as result.
The given polynomial expression is,

Now, Cecile add 0x as,

Now, here the product of 16 and 9 is 144. Therefore, the factors must have the product of 144 and sum of 0. Thus, by using the split the factor method as,

Thus, the Cecile factored the polynomial correctly by factor 16 x squared minus 9 using the X-method of factorization.
Learn more about factor of polynomial here;
brainly.com/question/24380382
Answer:
a^2 + 6^2:
3^2 + 6^2
9 + 36 = 45
answer: 45
a-b
3-4
-1
answer: -1
Step-by-step explanation:
Answer:
The greatest common factor is 2
Step-by-step explanation:
the greatest common factor is 2 because 6 98 and 140 are all numbers that can be multiplied by 2