Decrease = Rs 800- Rs 640= Rs 160
Percentage decrease = (Decreased amount / Original amount) * 100
= 640/ 800 * 100 = 80%
Answer:

Step-by-step explanation:
You are starting with ½ pie. Then you cut it into four pieces.
You want to evaluate ½ ÷ 4
Step 1. Treat the integer as a fraction

Step 2. Invert the divisor and change divide to multiply

Step 3. Multiply numerators and denominators

Answer: first option
Step-by-step explanation:
Let's make the following conversion:
40 inches to feet (Knowing that 1 feet=12 inches):

The formula for calculate the are of a rectangle is:

Where l is the lenght and w is the width.
Therefore, when you substitute values, you obtain the following result:

Answer:
It would be a 3/4 chance that he will pull the right 4 coins.
Step-by-step explanation:
Answer:
StartFraction negative 1 Over k cubed EndFraction
Step-by-step explanation:
3k / (k + 1) × (k²- 1) / 3k³
= 3k(k² - 1) / (k + 1)(3k³)
= 3k³ - 3k / 3k⁴ + 3k³
= -3k / 3k⁴
= -1/k³
StartFraction k + 1 Over k squared EndFraction
(k + 1) / k²
StartFraction k minus 1 Over k squared EndFraction
(k - 1)/k²
StartFraction negative 1 Over k cubed EndFraction
= -1/k³
StartFraction 1 Over k EndFraction
= 1/k