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g100num [7]
4 years ago
6

Simplify the expression 5y^2+3y+5+3y^2-5-3y-8y^2

Mathematics
1 answer:
tatiyna4 years ago
8 0
The expression is 5y^2+3y+5+3y^2-5-3y-8y^2.

Collecting the constants, the first degree, and second degree terms together we have:

(5-5)+(3y-3y)+(5y^2+3y^2-8y^2)=0+0+0=0.

Answer: 0
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Divide 42 in a ratio of 1:2:3?
Cloud [144]
Ratio 1:2:3 means we have x, 2x and 3x as the three parts

x+2x+3x = 42
6x = 42
6x/6 = 42/6
x = 7

Since x = 7, this means 2x = 2*7 = 14 and 3x = 3*7 = 21

Dividing 42 into the ratio of 1:2:3 means we have 7:14:21 as the answer

If we divide all three parts of 7:14:21 by the GCF 7, we reduce it down to 1:2:3

As a check, 
7+14+21 = 21+21 = 42
so it works out
6 0
3 years ago
78 is 15% of what #?
nirvana33 [79]
1. 78 = 0.15x
    78 / 0.15 = x
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2. | 3x - 2 | = 8                               | x + 1 | = 1

3x - 2 = 8      -(3x - 2) = 8            x + 1 = 1          -(x + 1) = 1
3x = 8 + 2      -3x + 2 = 8             x = 1 - 1           -x - 1 = 1
3x = 10           -3x = 6                  x = 0                 -x = 2
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ur answer is : x = -2

3. 3y - 4x + 5 = 0
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6 0
3 years ago
A test consists of 100 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean a
TEA [102]

Answer:  Mean = 20 and standard deviation = 4

Step-by-step explanation:

Let x represents the success of getting the correct answer.

Here, the total number of trials(n) = 100

The probability of getting the correct answer, p = 1/5

Thus, the mean of the number of correct answer,

\mu_x= np

\mu_x= 100\times 1/5

\mu_x= 20

Now, the standard deviation, \sigma_x= \sqrt{n\times p\times (1-p)}

\sigma_x= \sqrt{100\times 1/5\times 4/5}

\sigma_x= \sqrt{16}

\sigma_x= 4

Thus, First option is correct.



6 0
4 years ago
What is the value of a<br> Help please
erastova [34]

When the base and the height of a triangle are the same. the hypotenuse is that number times sqrt2.

B and C are 7, so a would also be 7

8 0
3 years ago
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andre [41]

Basically you subtract the amount of people who rode in cars so and divide the number you get by the number of buses.

404-5=399

399/7=57 kids on each bus

5 0
3 years ago
Read 2 more answers
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