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Vadim26 [7]
3 years ago
12

Please help i am confused

Mathematics
1 answer:
nexus9112 [7]3 years ago
5 0

Answer:

Step-by-step explanation:

If 70% passed both, then that means 30% passed either one test, or neither test.

Since 80% passed the first test, we know that 20% of the students failed the first test.

This means that the other 10% of the students came from the 80% that already passed the first test.

These make up 10/80 = 12.5% of the people that passed the first test, meaning your answer is 100-12.5=87.5%

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25 points
VMariaS [17]

Answer:

5 and 7

Step-by-step explanation:

because the problem said least two girls meaning substract

6 0
3 years ago
What is 341 divided by 674 plus 846 =
Citrus2011 [14]

Answer:

341÷674+846 is exaclly 846.505934718

4 0
3 years ago
Read 2 more answers
Is the following sentence a statement or not a statement? X and Y define a line
elixir [45]
Yes, that's a statement. Another example of a statement is "(0,0) is the origin." Something that wouldn't be considered a statement is something like "pi is a boring and confusing number."

Hope this helps!
8 0
3 years ago
Factor the following problems SHOW YOUR WORK<br> 1. x^2+16x+24<br> 2. x^2-10a+25
Juliette [100K]
There is no work to show. It is really just trial and error till you get the hang of it. You look at the multiples of the last term and find.which add or subtract to the middle terms coefficient. Use DeCartes law of signs to determine if it is plus or minus.
1. Does not factor solve using other method
2. (X-5)^2
7 0
3 years ago
A music store sold a total of 27 used trumpets and clarinets in one month. Trumpets cost $149 and clarinets cost $99. If total s
vodomira [7]
Answer: 16

Solution:

1) Use letters to identify the variables:

Number of trumpets: t
Number of clarinets: c

2) Translate each statement into algebraic (mathematical) language.

2.1) Sold a total of 27 used trumpets and clarinets

=> t + c = 27

2.2) Trumpets cost $149 and clarinets cost $99

Total cost of the trumpets: 149t
Total cost of clarinets: 99c

Total cost = 149t + 99c

2.3) Total sales were $3223

=> 149t + 99c = 3223.

3) State the system of equations:

Equation (1) t + c = 27
Equation (2) 149t + 99c = 3223

4) Solve the system of equations:

4.1) Multiply equation 1 by 149:

=> 149t + 149c = 4023

4.2) Subtract the equation (2) from the equation obtained in 4.1

=> 149c - 99c = 4023 - 3223

=> 50c = 800

=> c = 800 / 50 = 16

5) Verify the solution:

From equation (1) t = 27 - 16 = 11

Total cost = 149*11 + 99*16 = 3223

Now you have a verified answer: they sold 16 clarinets
7 0
4 years ago
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