Answer:
3.025 = 3.03
Step-by-step explanation:
A = (3.14)(r)(r)
28.74/3.14 = 9.152866
3.025 = r
For an instance, i stands for the money that you have, and b stands for the money that brother has.
An equation system based on the problem would be
i + b = 42 (equation 1)
i = 3b (equation 2)
Use substitution method to solve the problem
substitute 3b into i in the equation 1
i + b = 42
3b + b = 42
4b = 42
b = 42/4
b = 10.5
substitute the value of b into the equation 1
i = 3b
i = 3(10.5)
i = 31.5
You have $31.5 and your brother has $10.5
8x + 3 - 2(6 + 3x)
8(-6) + 3 - 2(6 + 3(-6))
-48 + 3 - 2(6 - 18)
-48 + 3 - 2(-12)
-45 + 24
-21
No, it is not 35% off... Let me explain. Let's say the original price is $100 to make the math easy. When you take 25% off then take an additional 10% off, the 10% is off of the discounted price, so
100 x 25% = 100 x .25 = 25 dollar discount
New price = $75
Now 10% off of $75
10% x 75 = .10 x 75 = $7.50 discount
New price = 75 - 7.50 = $67.50
Now, if you just took 35% off of $100
100 x 35% = 100 x .35 = $35 discount
New Price = 100 - 35 = $65
Bottom line... when you take an "extra" percentage off, you are taking a percentage of a smaller number, so the discount is not as big.
Gaining $25 rather than losing it
