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3 years ago

What is 100-A + 20 -70

Mathematics

2 answers:

Keith_Richards [23]3 years ago

8 0

Answer:

The answer is 50 - a.

Step-by-step explanation:

1) Collect like terms.

$- a + (100 + 20 - 70)$

2) Simplify.

$50 - a$

Therefor, the answer is 50 - a.

algol [13]3 years ago

6 0

Answer:

A=50

Step-by-step explanation:

assuming you mean 100-A+20-70=0

you need to solve for A, which means add all your numbers together and isolate A.

-A+50=0

A=50

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Suppose the price of a DVD rose from $15 to $17 and the quantity demanded decreased from 1,000 per month to 900 per month. Us

Andrews [41]

Answer:

Using the midpoint formula, the 12.5 percent change in price lead to a 10.5 percent change in the quantity demanded.

Step-by-step explanation:

This problem is related to the price elasticity of demand.

The price elasticity of demand is defined as the percent change in quantity demanded divided by the percent change in price.

Using the midpoint formula:

The formula for percent change in quantity demanded is:

Percent change in quantity demanded $=\frac{Q_{2}-Q_{1}}{\frac{(Q_{1}+Q_{2})}{2}} \times 100$

The formula for percent change in price is:

Percent change in price $=\frac{P_{2}-P_{1}}{\frac{(P_{1}+P_{2})}{2}} \times 100$

Given:

$Q_{1} = 1000\\Q_{2}=900\\P_{1}=\$15\\P_{2}=\$17$

Percent change in quantity demanded =

$=\frac{900-1000}{\frac{(900+1000)}{2}} \times 100\\=-10.53\%$

Percent change in price =

$=\frac{17-15}{\frac{(17+15)}{2}} \times 100\\=12.5\%$

The complete statement is:

Using the midpoint formula, the 12.5 percent change in price lead to a 10.5 percent change in the quantity demanded.

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