Help me please !!!!!

Mathematics

1 answer:

Natalka [10]3 years ago

8 0

Answer: DO you still need help I'll edit my answer if you do.

Step-by-step explanation:

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Simplify this problem

Murrr4er [49]

$\dfrac{49 - \frac{1}{r^2} }{7 - \frac{1}{r} }$

Rewrite the fraction as division:
$= (49 - \dfrac{1}{r^2}) \div (7 - \dfrac{1}{r} )$

Make them into single fraction:
$= \dfrac{49r^2 - 1}{r^2} \div \dfrac{7r - 1}{r}$

Change the divide fraction into multiplication fraction:
$= \dfrac{49r^2 - 1}{r^2} \times \dfrac{r}{7r - 1}$

Factorise the difference of square a² - b² = (a + b) (a - b) :
$= \dfrac{(7r+ 1)(7r - 1)}{r^2} \times \dfrac{r}{7r - 1}$

Cancel the common factors:
$= \dfrac{(7r+ 1)}{r}$

6 0

3 years ago

Read 2 more answers

How many hundredths in 45.972

timama [110]

It's the 7 because it"s in the hundredths spot. So it makes it 7 hundredths.

6 0

3 years ago

Solve system by addition. 3x=2y+10 9y=3x-7

Elden [556K]

for a fraction I got 3/7

3 0

3 years ago

What is the area of the circle to the nearest square foot if the circumference is 40?

Hunter-Best [27]

Answer:
127 square ft

Explanation:
The formula to find the area of a circle with a know circumference is: C^2/4 π.

40^2 is 1600 and 4 times pi is 12.56. Divide 1600 by the 12.56 and you will get your area of 127.39. The answer is 127 square ft after rounding to the nearest square foot.

7 0

3 years ago

A scientist removed a sample of 39.1 grams of a chemical from a container. The sample was 5 3/4 grams less than 3/10 of the tota

Verizon [17]

The total mass was 149.5 grams.

Setting up an equation, we have that the sample size, 39.1, is 5 3/4 (5.75) grams less than 3/10 of the total mass; this gives us

39.1 = 3/10x - 5.75

Adding 5.75 to both sides, we have
44.85 = 3/10x

Multiplying both sides by 10,
448.5 = 3x

Dividing both sides by 3,
149.5 = x

4 0

3 years ago