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4 years ago

Factorise the following expressions m²-9n²

Mathematics

1 answer:

Mashcka [7]4 years ago

3 0

Answer:

(m - 3n)(m + 3n).

Step-by-step explanation:

This is the difference of 2 squares, so we use the identity:

a^2 - b^2 = (a - b)(a + b).

So m^2 - 9n^2

(m - 3n)(m + 3n).

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Jaden and Joel both worked at the coffee shop today Jaden's total cups of coffee made is represented by f(x), and Joe's total cu

podryga [215]

Answer:

$6x+2$

Step-by-step explanation:

The complete question is

Jaden and Joel both worked at the coffee shop today. Jaden's total cups of coffee made is represented by f(x), and Joel's total cups of coffee made is represented by g(x). Use the functions below to write a function that represents the total cups of coffee they made today.

f(x) = 4x − 1

g(x) = 2x + 3

Options

6x + 2

2x + 1

2x − 4

4x + 4

we know that

To find out the total cups of coffee they made today, sum Jaden's total cups of coffee plus Joe's total cups of coffee

f(x)+g(x)

substitute the values

$(4x-1)+( 2x + 3)$

Group terms

$(4x+2x)+( 3-1)$

Combine like terms

$6x+2$

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4 years ago

Which one weighs more a pound of bricks or a pound of cotton balls?

lianna [129]

Neither because they bot weigh a pound

6 0

3 years ago

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The equation D=13/v shows that the density of a particular substance equals a mass of 13 grams divided by the volume of the subs

lions [1.4K]

For this case we have the following equation:
$D = \frac{13}{v}$
Where,
D: the density of a particular substance
v: the volume of the substance
When replacing v = 0 in the given equation we have:
$D = \frac{13}{0}$
$D = \infty$
This means that as the function acquires values very close to zero, the density acquires a very large value.
Answer:
as the volume approaches 0:
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 option 1

8 0

3 years ago

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Find the value of the expression

Yuri [45]

Answer:

18.5

Step-by-step explanation:

3 + 16 - 2 · 1 ÷ 4

3 + 16 - .5

19 - .5

= 18.5

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4 years ago

Your running speed is 8.5 miles per hour. A greyhound dog's speed is about 4.5 times faster than yours. What is the dog's speed?

Licemer1 [7]

The dog's speed is 38.95 miles per hour. Its easy! Just multiply 8.5 by 4.5 You get 38.25.

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3 years ago

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Factorise the following expressions m²-9n²​

Factorise the following expressions m²-9n²