First we need to multiply to make the fractions have equal denominators so we can add/subtract.
math: 1/3 x 4/4=4/12
science: 1/4 x 3/3=3/12
Now we can find the time she spent on history (I assume this is what you are looking for)
Total time-math time<span>-science time=history time</span>
12/12-4/12-3/12
=5/12
Amy spent 5/12 of her time working on history.
204204 - 16 = 204188
204188 / 4 = 51,047
width = 51,047
length = 51,055
The first thing we must do for this case is to calculate the scale factor.
For this, we make the relationship between two parallel sides.
We have then:

Substituting values we have:

We are now looking for the value of AB
We have then:

Substituting values:

Answer:
The scale factor is:

The value of AB is:

90 degrees because perpendicular lines<span> are two or more lines that intersect at a 90-degree angle.</span>
Answer:


Step By Step Explanation:
Apply Fraction Cross Multiply: If 




Subtract 4 From Both Sides

Simplify

Subtract 2x From Both Sides

Simplify

Divide Both Sides By 8

Simplify

Turn Fraction Into Decimal


Regards,
Mordancy