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2 years ago

At East Junior High School, there are a total of 1175 students in the 7th and 8th

Mathematics

1 answer:

Agata [3.3K]2 years ago

5 0

Answer:

7th grade has 1100 and 8th has 75

Step-by-step explanation:

here's why...........1100 plus 75 is the total of 1175

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What is the exact value for the expression the square root of 56. − the square root of 14. + the square root of 126.? Simplify i

Olenka [21]

Sqr root of 56 - sqr root of 14 + sqr root of 126= sqr root of (4x14) - sqr root of 14 + sqr root of (9x14)= 2(sqr root of 14) - (sqr root of 14) + 3(sqr root of 14)= 4(sqr root of 14)
The right answer will be B.

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2 years ago

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Rohan is very intelligent in maths. He always try to relate the concept of maths in daily life. One day he is walking away from

HACTEHA [7]

Answer:

Which of the following correctly completes the following equation:

Nitrogenous base + sugar + phosphate group =

Step-by-step explanation:

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2 years ago

Anson estimated he would need 17 hours to complete his science project. He actually needed 19 1 2 hours. What was his percent er

STatiana [176]

Answer:

The percentage of error is 14.71 %.

Step-by-step explanation:

Given:

Estimated time for completion of project is, $ET=17\ h$

Actual time for completion of project is, $AT=19\frac{1}{2}=\frac{39}{2}\ h$

Difference in error = $AT - ET = \frac{39}{2}-17=\frac{39-34}{2}=\frac{5}{2}=2.5\ h$

Percentage in error = $\frac{2.5}{17}\times 100=14.71\%$

Therefore, the percentage of error is 14.71 %

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2 years ago

the 8th term of an arithmetic sequence is -42 and the 16th term is -74. Find and simplify an expression for the nth term

Ugo [173]

Answer:

$a_{n}$ = - 4n - 10

Step-by-step explanation:

the nth term of an arithmetic sequence is

$a_{n}$ = a₁ + (n - 1)d

where a₁ is the first term and d the common difference

given a₈ = - 42 and a₁₆ = - 74 , then

a₁ + 7d = - 42 → (1)

a₁ + 15d = - 74 → (2)

subtract (1) from (2) term by term to eliminate a₁

8d = - 74 - (- 42) = - 74 + 42 = - 32 ( divide both sides by 8 )

d = - 4

substitute d = - 4 into (1) and solve for a₁

a₁ + 7(- 4) = - 42

a₁ - 28 = - 42 ( add 28 to both sides )

a₁ = - 14

Then

$a_{n}$ = - 14 - 4(n - 1) = - 14 - 4n + 4 = - 4n - 10

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2 years ago

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If 2500 is to be divided among Ravi, Raju and Roy, so that Ravi gets two parts, Raju has

fenix001 [56]

Answer:

The money each will get are 500 to Ravi , 750 to Raju and 1250 to Ravi. And there percentages are Ravi's 20%, Raju's 30% and Roy's 50%.

Step-by-step explanation:

Given:

2500 is to be divided among Ravi, Raju and Roy, so that Ravi gets two parts, Raju has three parts and Roy five parts.

Now, to find the money each will get and the percentages of it.

Let the price of one part be $x.$

The price of two parts be $2x.$

The price of three parts be $3x.$

And the price of five parts be $5x.$

According to question:

$2x+3x+5x=2500.$

$10x=2500$

Dividing both sides by 10 we get:

$x=250.$

Ravi gets two parts = $2x=2\times 250=500.$

Raju gets three parts = $3x=3\times 250=750.$

Roy gets five parts = $5x=5\times 250=1250.$

Now, the percentage of the money they get:

Percentage of Ravi's share:

$\frac{500}{2500} \times 100\\=\frac{50000}{2500} \\=20\%.$

Percentage of Raju's share:

$\frac{750}{2500} \times 100\\\\=30\%.$

Percentage of Roy's share:

$\frac{1250}{2500} \times 100\\\\=50\%.$

Therefore, the money each will get are 500 to Ravi , 750 to Raju and 1250 to Ravi. And there percentages are Ravi's 20%, Raju's 30% and Roy's 50%.

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2 years ago