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Dafna11 [192]
3 years ago
12

In a class of 35 students, 10 students have a brother, 15 have a sister and 7 have both a brother and a sister.

Mathematics
1 answer:
stiks02 [169]3 years ago
8 0
So what is the question?
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Which equation could be used to solve the following system?
nikdorinn [45]

we have

x+y=11

x=11-y --------> equation A

4x^{2} -3y^{2}=8 ----> equation B

Substitute equation A in equation B

4(11-y)^{2} -3y^{2}=8

therefore

<u>the answer is the option B</u>

4(11-y)^{2} -3y^{2}=8

8 0
3 years ago
Read 2 more answers
Is a download speed of 40.64 mbps the same as 5 mbps?
Kazeer [188]
No they are different speeds- 40mbps is faster , however both have the same units
6 0
3 years ago
Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 75 degrees Celsius. He looks in a reference book
MissTica

Answer:

6.25%

Step-by-step explanation:

Percent error is calculated by taking the difference of measured value and correct value divided by correct value and multiplied by 100%.

Mathematically,

Percent error = (correct value - measured value)/correct value  * 100%

_________________________________________________

in the problem given

measured value = 75 degrees Celsius

correct value = 80 degrees Celsius ( as given in reference book)

thus,

Percent error = (80 - 75)/80 * 100%

Percent error = (5/80 )* 100% = 6.25%

Percent error calculated by him is  6.25%.

4 0
3 years ago
Type the correct answer in each box. If necessary, use / for the fraction bar(s). Mike can stitch 7 shirts in 42 hours. He can s
Arada [10]

Answer:

1 shirt for every 6 hours

Step-by-step explanation:

42/7=6

8 0
3 years ago
-2x+9=9 solved y substitute
Varvara68 [4.7K]

Answer:

x=0

Step-by-step explanation:

-2x+9=9

-2x=9-9

-2x=0

x=0/-2

x=0

6 0
3 years ago
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