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4 years ago

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Mathematics

1 answer:

kenny6666 [7]4 years ago

5 0

Given that this is based on simple interest, in the first case, investing at 4% for 3 years gives a total interest of 4%*3 = 12%. In the second case, investing at 6% for 4 years gives a total interest of 6%*4 years = 24%. (We can do this since the same principal is given to both.) This is exactly double that of the first case of 12%, so the second choice is the right answer.

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How can you solve x-8y=40?

OLga [1]

$Simplifying
x + -8y = 40

Solving
x + -8y = 40

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '8y' to each side of the equation.
x + -8y + 8y = 40 + 8y

Combine like terms: -8y + 8y = 0
x + 0 = 40 + 8y
x = 40 + 8y

Simplifying
x = 40 + 8y$

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3 years ago

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Is renters insurance a fixed or variable expense?

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2 years ago

Please help me due today?

prohojiy [21]

7x - 1 = 4x + 8
3x = 9
x = 9

ABD
7(3) - 1
21 - 1
20

DBC
4x + 8
4(3) + 8
12 + 8
20

3x - 17 + x + 40 + 2x - 5 = 180
6x + 18 = 180
6x = 198
x = 33

3(33) - 17
99 - 17
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3 0

3 years ago

If y varies directly with x, Write an equation relating x and y when y = -30 and x = 6.

ziro4ka [17]

Answer:

$y=-5x$

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form $y/x=k$ or $y=kx$

For $x=6,y=-30$

substitute

$y/x=k$ ------> $k=-30/6=-5$

therefore

$y=-5x$

7 0

4 years ago

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A rollercoasterbrises 210 feet into the air, drops 240 feet, rises 80 feet before dropping another 30 feet again. Finally the ro

professor190 [17]

Answer:

-30 feet

Step-by-step explanation:

What we know:

The rollercoaster first rose 210 feet, so after rise 1, the height is +210 feet.

After that, it dropped 240 feet. This is greater than the 210 feet it initially rose, so the number is now negative. The height is now -30 feet.

210 - 240 = -|240-210| = -|30| = -30 feet

After that, it rose another 80 feet. That outdoes the eariler -30 feet, so we're back to a positive height. After that rise, the height is now +50 feet.

-30 + 80 = |80 - 30| = |50| = 50 feet

Then the last two drops combine for a 80-foot drop. This is greater than the +50-foot height it was at, so we're back at -30 feet.

50 - 80 -|80 - 50| = -|30| = -30 feet after the last drop

8 0

3 years ago