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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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When solving -1/8 (x + 35) = −7, what is the correct sequence of operations?

mariarad [96]

ANSWER:

Division, multiplication, addition is the correct sequence of operations for solving $-\frac{1}{8}(x+35)=-7$

SOLUTION:

Given, equation is $-\frac{1}{8}(x+35)=-7$

We need to solve the given equation in correct sequential order.

So, let us follow the BODMAS rule.

BODMAS means sequence of operations are brackets, orders, division, multiplication, addition, subtraction

Now,

$-\frac{1}{8}(x+35)=-7$

As the term in brackets cannot be processed further we can go for next term.

Now the division operation has to be done first according to BODMAS

- 0.125(x+35)= -7

Multiplication comes second in order.

-0.125x+4.375= -7

On rearranging the terms, we get

-0.125x+4.375+7=0

Now perform addition according to BODMAS

-0.125x+11.375=0

0.125x=11.375

$x=\frac{11.375}{0.125}=91$

Hence division, multiplication, addition is the correct sequence of operations for solving $-\frac{1}{8}(x+35)=-7$

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2 years ago

Finding the Slope of a Line Given a Table

mixer [17]

Answer:

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Step-by-step explanation:

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2 years ago

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kala used 12.86 gallons of fuel while driving now 1.6 gallons are left how much fuel did kala car have before her trip

Troyanec [42]

Her car had 14.46 gallons of fuel before her trip because 12.86+1.6=14.46

8 0

2 years ago

Find the arc length of the semicircle.

Olegator [25]

180° because it is half of a full circle(360°)

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2 years ago

A ball is thrown straight up with a initial velocity of 56 feet per second . The height , h , of the ball t seconds after it is

Tju [1.3M]

Formula: H(t) = 56t – 16t^2

H(t) = - 16t^2 + 56t

A. What is the height of the ball after 1 second? H (1) = 56(1) – 16(1) ^2 = 40 pt.

B. What is the maximum height? X = - (56)/2(- 16) = 1.75 sec h (1.75) = 56(1.75) – 16(1.75) ^2 h (1.75) = 49ft.

C. After how many seconds will it return to the ground? – 16t^2 + 56t = 0 - 8t =0 t = 0

- 8t (2 + - 7) = 0 2t – 7 = 0 t = 7/2 Ans: 3.5 seconds

3 0

3 years ago