AB←→ is perpendicular to CD←→. How many 90° angles are formed by the intersection?

Mathematics

2 answers:

daser333 [38]4 years ago

6 0

4. Think of a lower t, there are 4 equal angles

myrzilka [38]4 years ago

6 0

Answer:

Step-by-step explanation:

If two lines are perpendicular to each other, they are said to create a 90° angle at the point of intersection.

There are clearly four 90° angles when lines AB and CD meet at 90°. It is shown in the picture attached. [Note: even if you translate the intersection point up or down, still there are four 90° angles.]

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ariane borrows $400 on a 4-year loan. she is charged 5% simple interest per year . How much interest is she charged for 4 years?

vodomira [7]

Answer:

Interests charged for 4 years: $80
Total amount to pay back:$480

Step-by-step explanation:

To know the future value of an specific amount that is borrowed from a bank we use the following equation: $FV= PV\imes{(1+n\times{i})}$ , where FV is future value, PV present value, n the amount of periods and i the interest rate.
In this particular case, the present value of the loan is $400, n=4 (4 years), i=5%. Then the future value equals: $FV= 400\times(1+4\times0.05)$ . Then FV= $480, which is the total amount of money she would have to return in 4 years.
The interest paid can be calculated as the total amount paid ($480) minus the inicial loan ($400), which means that total interests paid= FV- PV= $80.