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3 years ago

Why do we use letters in mathematics?

2 answers:

6 0

I would say we use letters in mathematics so you can understand the problem more or whats really happening for example if they ask you question about how many people went to the party and bought stuff without the letters and only numbers you'll be confused...like umm...how many people went what are the stuff they bought.Or another example is if the question only had an empty graph.People would be like what do I have to do with the empty graph.What's the problem etc.So math problems without letters would be confusing.

icang [17]3 years ago

3 0

We use letters to substitute for unknown numbers. I hope this helps. :)

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Make x the subject of h = 4(x + 3y) + 2<br>

ratelena [41]

H = 4(x + 3y) + 2
H = 4x + 12y + 2
H - 12y - 2 = 4x
(H - 12y - 2) / 4 = x or 1/4H - 3y - 1/2 = x

6 0

3 years ago

What does the 5 in the decimal .257 represent

Ira Lisetskai [31]

Answer: five hundredths

6 0

3 years ago

Use the given information to determine the exact trigonometric value.

hoa [83]

Answer:

Step-by-step explanation:

Use the main trigonometric equality:

$\cos ^2\theta+\sin^2\theta=1.$

Since $\sin\theta=-\dfrac{1}{5},$ you have that

$\cos^2\theta=1-\left(-\dfrac{1}{5}\right)^2=1-\dfrac{1}{25}=\dfrac{24}{25}.$

You know that $\pi$ thus $\cos \theta$

and

$\cos\theta=-\sqrt{\dfrac{24}{25}}=-\dfrac{2\sqrt{6}}{5}.$

6 0

3 years ago

1/3 of the guests chose beef , 5/12 of the guests chose chicken 69 of the guests choose vegetarian how many guests were there at

Vlad1618 [11]

we can call guest x

1/3x+5/12x+69=total guests at the wedding

if we multiply 1/3 by 4 we get 4/12. we can add 4/12 to 5/12 to get 9/12 which can be reduces to 3/4. that means the vegetarian guests make up 1/4 of the wedding. if 69 is 1/4, then we have all the information we need to solve this

25% 69 ----- ------ 100% ?

we are solving for the question mark. this is just a diagram. we know 25% of the 100% of the guest and we know that we have 69 of the however many guest. multiply 100 by 69

100x69=6900

now divide 6900 by 25

6900/25=276 guests at the wedding

8 0

3 years ago

A company's profit of $2.56x10^7 will be shared equally by 4,000 employees. How much money will each employee receive? Write you

kirza4 [7]

Answer:

$6,400.00

Step-by-step explanation:

Following the rule of PEMDAS,

exponents go first in this scenario.

10^7 = 10000000

2.56*10000000 = 25600000

Then, divide the amount of money by the number of employees.

25600000/4,000 = 6400

Each employee would receive $6,400.00

4 0

2 years ago