100 IF U GET THIS RIGHT!
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Answer:
Step-by-step explanation:
<h3>to understand this</h3><h3>you need to know about:</h3>- factoring
- PEMDAS
- quadratic expression:ax²+bx+c
factoring quadratic:
- Find two numbers that multiply to give ac, and add to give b
- rewrite the middle with those numbers
- factor out common terms
- group
a is 3 and b is -7
therefore
now we need to find two numbers that give -21
to do so we need to find the factors of 21
which are
likewise,
in this case we can take any two numbers from negative and positive factors that give us -21 and -4
3 and -7 are the two numbers that multiply to give -21 (3×-7=-21) and add to give -4. (3+(-7)=-4)
now let's factor:
Alright, lets gets started.
Jullianne's start-up costs for the building, advertising, and supplies total $52,000.
she spends $680 on operating costs on daily basis.
Means Suppose the days d, the operating cost will be=
This cost will be added in her start up cost.
The earning for d days will be =
So, part A :
Now suppose after d days, she will start making profit means, after d days, her cost will be equal to her earning.
So, part B:
Subtracting 680 d from both sides
Dividing 280 in both sides
Means after 19 days, she will start making profit. : Answer
Hope it will help :)