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3 years ago

Can someone tell me the error in this problem

Mathematics

1 answer:

NikAS [45]3 years ago

7 0

Answer:

You got your negatives messed up. The answer was -5y-4x

Step-by-step explanation:

Expression: -8y + 5x + 3y -9x

Your objective: Simplify the expression

The First step, Combine like terms meaning -8y+3y and -9x+5x

Solve, -8y+3y

That would equal -5y

Next solve -9x + 5x

That would equal -4x

Write your expression in simplest form:

-5y-4x

What you did:

You combined like terms but didn't follow the negative rules

Remember: Positive and Negative = Negative

Negative and Negative = Positive

For example -8y + 3y

You chose to add -8 and 3 which you got -11

What you were supposed to do was to subtract.

A helpful trick: Since they are like terms you could rearrange the questions like this 3y-8y+5x-9x, You can see that you have to do subtraction left to right

3y-8y= -5y

5x-9x= -4x

Solution: -5x-4x

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And then the value of t would be:

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Step-by-step explanation:

For this case since we know that the interest is compounded continuously, then we can use the following formula:

$A =P e^{rt}$

Where A is the future value, P the present value , r the rate of interest in fraction and t the number of years.

For this case we know that P = 100000 and r =0.12 we want to triplicate this amount and that means $A= 300000$ and we want to find the value for t.

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We divide both sides by 100000 and we got:

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Now we can apply natural logs on both sides;

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And then the value of t would be:

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3 years ago

Find the length of WY

DENIUS [597]

Answer:

WY = 180

Step-by-step explanation:

the diagonals of an isosceles trapezoid are congruent , so

ZX = WY , that is

8y - 4 = 7y + 19 ( subtract 7y from both sides )

y - 4 = 19 ( add 4 to both sides )

y = 23

Then

WY = 7y + 19 = 7(23) + 19 = 161 + 19 = 180

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2 years ago

Can someone tell me the error in this problem ​

Can someone tell me the error in this problem