Answer:
18π
Step-by-step explanation:
Lateral Surface Area = 2πrh
Plug in the numbers into the equation.
but leave the pi
Use cosine rule:
c²=b²+a²-2ba cosC
Right triangle = 90 degrees
cosine 90 degrees = 0
c²=28²+15²-2×28×15×0
c²=28²+15²
c=√1009
c=31.8 in
Answer:
8.3 X 10^-10
Step-by-step explanation:
Since the exponent of the scientific notation is negative, move the decimal point
10
places to the left.
0.0000000083
2a + 21 = 8a - 9
Combine like terms.
2a + 21 = 8a - 9
-2a -2a
21 = 6a - 9
+9 +9
30 = 6a
6a/6 = 30/6
a = 5
Answer: a = 5
