Volume of a rectangular prism = l × w × h.
In this case,
V = 270 cubic feet
l = 15 feet
w = 4 ft
h = ?
Plug our values into the volume formula.
270 cubic feet = 15 feet × 4 feet × h.
Simplify the right side
270 = 60 × h.
Divide each side by 60.
4.5 = h
The height is 4.5 feet.
Answer: 
<u>Step-by-step explanation:</u>
Note the following identities: tan² x = sec²x - 1

tan² x + sec x = 1
(sec² x -1) + sec x = 1
sec² x + sec x - 2 = 0
(sec x + 2)(sec x - 1) = 0
sec x + 2 = 0 sec x - 1 = 0
sec x = -2 sec x = 1

14.25+2.30=16.55 so, dr spent $16.55 on school supplies
Answer:
x=-1
Step-by-step explanation:
1.) 2-3(2x-1)=-6x+5
2.) -1(-2x-1)=-6+5
3.) (2x+1)=-6+5
4.) (2x+1)=-1
5.) 2x=-2
6.) x=-1