Answer:
A. 45
Step-by-step explanation:
multiply 15 x 3 =45
(a+b)(a-b)=a^2 - b^2
so
<span>(4x-7)(4x+7) = 16x^2 - 49
answer
</span>16x^2 - 49
Answer:
Part 1) 
Part 2) 
Step-by-step explanation:
Part 1) we know that
To put factor back into the square root, we have to put squared value
we have

Remember that

substitute in the expression above

Part 2) we have

Solve for x
That means----> Isolate the variable x
Multiply in cross

Apply distributive property

Group terms

Factor x left side

Divide by (2c-ab) both sides

Divide the two numerators and get 3.25 multiply 13 hours by that and the answer to the first part is 42.25
Answer:
7/20
Step-by-step explanation:
To add fractions, the first step is to get a common denominator
1/4 + 1/10
The common denominator is 20
1/4 *5/5 = 5/20
1/10 *2/2 = 2/20
5/20 + 2/20 = 7/20