Hi
<u>The area of a triangle is </u>
![\cfrac{base*height}{2}](https://tex.z-dn.net/?f=%5Ccfrac%7Bbase%2Aheight%7D%7B2%7D)
If we plug in the given values, we get:
![\frac{10*7}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B10%2A7%7D%7B2%7D)
Multiply in the numerator:
![\frac{70}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B70%7D%7B2%7D)
Divide:
![35](https://tex.z-dn.net/?f=35)
Therefore, the area of the triangle is 35 inches squared.
Answer:
The submarine would be 900 below the ocean surface after 12 minutes assuming it started its descent at the surface of the ocean.
Step-by-step explanation:
The formula for distance traveled (in this case the distance a submarine descends) over a period of time is:
d
=
r
⋅
t
where
d
is the distance traveled (or descended),
r
is the rate of travel and
t
is the time.
In this problem we are told the rate,
r
is 75 feet per minute. And, we are told the time,
t
, to calculate for which is 12 minutes.
(0.75 * 3.5a) + (0.75 * -6b) = 2.63a -4.5b