The sum will be prime if its 2, 3, 5, 7, 9, 11, or 13
0+2=2
1+2=3
5+2=7
9+2=11
0+3=3
1+4=5
9+4=13
0+7=7
That's 8 combinations, and there 4*4=16 total.
8/16 = 1/2.
Ratio of height of the man to the length of the shadow = 6:9 = 2:3
Ratio of height of the tree to the length of its shadow = x:25 = 2:3
x/25 = 2/3
x = (25 x 2)/3 = 50/3 = 16.67
Therefore the approximate height of the tree to the nearest foot is 17 feet.
Answer:
It travels 1/5 mile in one second
Step-by-step explanation:
1/10 * 2 = 2/10 = 1/5
Since the bolt of lightning travels 1/10 mile in half a second, then to find how much it travels in one a second you simply multiply 1/10 by 2, which equals 2/10, which can be simplified to 1/5.
