First you can change 3 to 10/10 so that they can have the same denominator. Now, since you do that the number is now 2.
Now, do 10/10-1/10=9/10.
After do 2-4=-2.
So, your final answer is -2 9/10.
To solve this problem, just use multiplication.

You can somewhat think of this situation as a sort of tree. You start with 7 large branches representing the pants, then for every one of those you have 3 medium-sized branches to represent the pairs of pants. Each one of those has 5 sticks for the ties, which in turn each have 6 leaves to represent the jackets and therefore a complete outfit. The solution is found by getting the total number of leaves on the tree.
Answer:
C.
Step-by-step explanation:
Well, we know the last three numbers are:
3 (ones)
6 (tens)
7 (hundreds)
The next set is:
9 (thousands)
3 (ten thousands)
0 (hundred thousands)
And finally:
6 (millions)
5 (ten millions)
6 (hundred millions)
So we know that 5 is in ten millions.
This is a 30-60-90 special triangle. in a 30-60-90 right triangle, the shortest leg is half of the hypotenuse, and the other leg is (√3)/2 of the hypotenuse,
so FA=(1/2)AD=7, DF=(√3)/2)*14=7√3
the area is (1/2)*7*7√3≈42.4