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Darina [25.2K]
2 years ago
9

Here are two stories: The initial freshman class at a college is 10% smaller than last year’s class. But then during the first w

eek of classes, 20 more students enroll. There are then 830 students in the freshman class.
A store reduces the price of a computer by $20. Then during a 10% off sale, a customer pays $830

here are two equations: 0.9x+20=830, 0.9(x-20)=830

A. Decide which equation represents each story.

B. Explain why one equation has parentheses and the other doesn't.

C.Solve each equation, and explain what was the solution means in the situation.

Thank you to the people that answered my questions!
Mathematics
2 answers:
Naddika [18.5K]2 years ago
8 0

Answer:

hola hablas español????????????

Trava [24]2 years ago
7 0
I’m done but it won’t let me paste it here
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#72 i will give brainliest to the best answer!​
Zarrin [17]

Step-by-step explanation:

Select all of the following that are quadratic equations.

x² + 3x - 5 = 0 ✓

x² - x = 3x + 7 ✓

5x - 7 = 0 X

7x² + 14x = 0 ✓

x³ - 3x² + 1 = 0 X

x - 5 = 9x + 7 X

What is quadratic equations?

Quadratic equations is a equation that has a general form like "ax² + bx = c"

For example :

x² + 3x - 5 = 0

x² + 3x = 5

x² → ax²

3x → bx

5 → c

4 0
1 year ago
On monday marco practiced the piano for 7/10 hour. On Tuesday he practiced for 1 1/4 hours each day write a question that involv
Fantom [35]

Step-by-step explanation:

Since we have given that

Number of hour Marco practiced the piano on Monday is given by

\frac{7}{10}

Number of hours Marco practiced the piano on Tuesday is given by

1\frac{1}{4}=\frac{5}{4}\ hours

1) For Adding :

Total number of hours he practiced on both Monday and Tuesday will be

\frac{7}{10}+\frac{5}{4}\\\\=\frac{14+25}{20}\\\\=\frac{39}{20}\ hours

2) For Subtraction,

Number of hour he practiced more on Tuesday than on Monday will be

\frac{5}{4}-\frac{7}{10}\\\\=\frac{25-14}{20}\\\\=\frac{9}{20}\ hours


4 0
3 years ago
Read 2 more answers
How do you find the inverse of a 3x3 matrix?
mel-nik [20]
If you have a graphing calculaator enter the matrix then on the outside of it hit the ^ button and put -1
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7 0
3 years ago
PLEASE HELP LAST QUESTION
blagie [28]

Answer:green area- triangle area = 72-9 = 63

Step-by-step explanation:

4 0
3 years ago
The scale model of a skyscraper being built is 4.2 feet tall. When it is finished, the skyscraper will be 525 meters tall. What
luda_lava [24]
There are two scales that may be possible for this scale model; one where it's for every foot and one where it's for every meter.
The for every foot would be better to find out since the scale would be easier to use.
First, you have to divide each sided by 4.2, since you want to find how many meters for each foot.
4.2 \div 4.2 = 1 \\ 525 \div 4.2 = 125
For every 1 foot used in the model, the actual will be 125 meters.
1 ft = 125 m
8 0
3 years ago
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