Answer:
T10 = 1403.
Step-by-step explanation:
8 27 66 131 228
Differences in terms are 19 39 65 97
20 26 32 <-------- increasing by 6
We can extend this to 19 39 65 97 135 179 229 285
20 26 32 38 44 50 56 62
347 415
68
So the 6th term is 228 + 135 = 363.
7th is 363 + 179 = 542
8th term = 542 + 229 = 771
9th term = 771 + 285 = 1056
10th term = 1056 + 347 = 1403.
Solve for the two velocities:
with the current = 48/6 = 8 mph
against the current = 48/8 = 6 mph
bv= boat velocity in still water
cv = current velocity
A) bv -cv = 6mph
B) bv + cv = 8mph
Adding both equations
2 * bv = 14 mph
boat velocity = 7 mph
current velocity = 1 mph
Calculator and tutorial can be found here:
http://www.1728.org/veloccal.htm
Answer:
21
Step-by-step explanation:
7×24
8
24÷8=3
3×7=21
X + 388 = 388 + 152
x + 388 = 540
-388 -388
------------------------
x=152