15 points!

explain.

a right triangular prism has a height of 3 ft, a width of 4 ft, and a hypotenuse of 5 ft. the depth of the triangle is missing. if the surface area of the triangular prism is 192 square ft, find the depth of the triangular prism.

The formula of the Volume is followed by the model: V = Bh
Where B is the area of the triangle, which is given - 192ft² and h is the height, between the two ends.

V = ? 
B = 192ft²
h = 3ft
Following the equation;
V = 192 * 3
∴ = 576ft³

I hope you followed through. Also on note, if you aren't given the S.A [surface area], you will be required to use the Area formula. A = 1/2×base×height.
Lets say we didnt know the area, your working should look like this ;
V = Bh
V =? 
B = 1/2bh
h = 3ft
Thus,
V = 1/2(b)(h)(3)
Substitute the figures into b and halso, the brackets means multiply. 

Hope this helped you :)

at 0 hours the plane has 422,000 gallons of gas.

after 2 hours it has 369,250 gallons.

subtract to find the difference and then divide by 2 hours:

422000 – 369250 = 52750 /2 = 26,375 gallons per hour.

can also do the full 16 hours:

the plance used 422,000 gallons in 16 hours:

422,000 / 16 = 26,375 gallons per hour.