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3 years ago

10

150 students took part in a quiz. there are twice as many girls as boys in the school: (a) how many girls were there? (b) how ma

ny were boys?

1 answer:

muminat3 years ago

6 0

75 boys and 75 girls I divided 150 by 2

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Simplify the expression. 8x^-10 y^'6 -2x^2y^-8 Write your answer without negative exponents.

sergij07 [2.7K]

Answer:

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^{14} - 2x^{12}}{x^{10}y^8}$

Step-by-step explanation:

Given

$8x^{-10}y^6 - 2x^2y^{-8}$

Required

Simplify

Rewrite as:

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^6}{x^{10}} - \frac{2x^2}{y^8}$

Take LCM

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^6*y^8 - 2x^2 * x^{10}}{x^{10}y^8}$

Apply law of indices

$8x^{-10}y^6 - 2x^2y^{-8} = \frac{8y^{14} - 2x^{12}}{x^{10}y^8}$

8 0

3 years ago

An electrician charges $40 per visit, and $20 per hour of work. On a particular day, he made 3 visits and calculated that his av

saw5 [17]

Answer:

4 hours

Step-by-step explanation:

For three visits, the electrician earned $40 × 3 = $120 in "per-visit" charges. For working x hours, he earned 20x in "per-hour" charges. The total of these came to 50x:

120 +20x = 50x

120 = 30x . . . . . . . . subtract 20x

4 = x . . . . . . . . . . . . . divide by 30

The electrician worked 4 hours that day.

3 0

3 years ago

An item costs $330 before tax, and the sales tax is $23.10 . find the sales tax rate. write your answer as a percentage.

ad-work [718]

Divide sales tax amount over the item's cost
23.1 / 330 = 0.07
Therefore the sales tax is 7%

3 0

3 years ago

Collectively, what are the interest costs and other fees for using a credit card called?

Triss [41]

Answer:

credit line but this is more of business not a math subject btw

5 0

3 years ago

What is the domain of f(x) = 2|x − 1| + 3?

Wewaii [24]

Answer:

<h2>The domain=3</h2>

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers