Step-by-step explanation:
20 x 399 x 5
= (20×5) × 399
= 100×399
= 39,900
Answer:

Step-by-step explanation:
The surface area of right triangular prism is the sum of area of two base triangles and 3 area of side rectangles.
The area of base triangle is

where a is the length of the side of equilateral triangle. In your case, a=6 inches. Thus,

The area of side rectangle is

where h is the height of the rectangle. In your case, h=10 inches. Thus,

Hence, the surface area is

Answer:
Milk: 2 cups
Flour: 5 cups
Sugar: 4 cups
Step-by-step explanation:
(First divide all ingredients by 2)
Milk: 3 -> 1.5
Flour: 5 -> 2.5
Sugar: 6 -> 3
(Next, multiply all by 4)
Milk: 1.5 -> 6
Flour: 2.5 -> 10
Sugar: 3 -> 12
(Divide by 3)
Milk: 6 -> 2
Flour: 10 -> 5
Sugar: 12 -> 4
To find ten percent, you divide by ten. Then multiply that answer by five to get fifty percent. Subtract that answer from the original price. But because this one is fifth you could just divide by two.