The arnold family arrived at the beach at 10:30 A.M.
10:30
Add 3 hours and 3/4 minutes to that
3/4 = 75% of 60
.75 * 60 = 45
3 hours and 45 minutes
10:30 >> 3 hours more = 1:30
1:30 + 45 mins = 2:15
Answer would be: They left at 2:15
Answer:
hello :
Step-by-step explanation:
39w^5 - 13w^5 = 13w^5 (3 - 1) = 26w^5
Trigonometry as taught is mostly about memorizing two lousy triangles, namely half a square and half an equilateral triangle. This one is half an equilateral triangle.
The respective opposite sides of the 30/60/90 triangle are in ratio 
A sine of √3/2 is an opposite of √3 and a hypotenuse of 2, so opposite and hypotenuse of the 60 degree angle. (It's the mama bear, in the middle, just right.)

In the end you just have memorize the two tired triangles of trig.
If you would like to know what is the answer for 6 - 7/8, you can calculate this using the following steps:
6 - 7/8 = 48/8 - 7/8 = (48 - 7) / 8 = 41/8 = 5 1/8 = 5.125
The correct result would be 41/8 or 5 1/8.