3 years ago

Erica solved the equation −5x − 25 = 78; her work is shown below. Identify the error and where it was made.

Mathematics

1 answer:

Romashka-Z-Leto [24]3 years ago

8 0

In step one, you are supposed to add 25 to both sides, because if you just subtract, it would be -5x-50=53

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Mark earned $40 mowing lawns last week. He spent 3/5 of his money on two books. How much did he spend on those two books?

N76 [4]

First, convert 3/5 to a percent by multiplying it by 20/20, getting 60/100, or 60%. Then, find 60% of 40 by multiplying 60 by 40 to get 2,400 and divide it by 100 to get 24, meaning Mark spend $24 on both books. Each of the books cost $12, as 24/2 is 12.

3 0

2 years ago

What are the solutions to 0=x^2-x+1?

kumpel [21]

Answer: No solutions

Step-by-step explanation:

There are no solutions to 0 = x² - x + 1.

[Method One]

We can solve this by rewriting the equation, but it is quicker to graph it when there are no solutions. See attached.

[Method Two]

I said we can solve this by solving an equation, here it is. We will use the quadratic formula since the equation given is already in the proper form.

$\displaystyle x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}$