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Crazy boy [7]
3 years ago
12

What is the value of the expression? 200 - 42 + 9 · 10

Mathematics
2 answers:
OleMash [197]3 years ago
7 0

Answer: 247

Step-by-step explanation:

Use PEMDAS order. (Parentheses, exponents, multiplication, division, addition, subtraction)

200 - 42 + 9 · 10

200-42+ 90

157+90

247

tekilochka [14]3 years ago
5 0

Answer:

248

Step-by-step explanation:

Given: 200 -42 + 9.10

First we have to multiply 9 and 10, we get

= 200  - 42 + 90

Now we have to the positive numbers 200 and 90

= 290 - 42

Subtract 42 from 200, we get

= 248

Answer : 248

Hope you will understand the concept.

Thank you.

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What is the value of the expression if m = –5 and n = 3? Negative StartFraction 24 Over 25 EndFraction Negative StartFraction 4
KatRina [158]

You can use the fact that  a number raised to negative powers can be written as 1 divided by that number raised to positive number.

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<h3>How can we rewrite a number raised to negative power?</h3>

Suppose we've got a^{-b} . then it can be rewritten as

a^{-b}  = \dfrac{1}{a^b}

It is because a^0 = 1 for any a except 0, and that  \dfrac{a^0}{a^b} = a^{0-b} = a^{-b}

If base are same and there is multiplication, then there will be addition in power.

Also, know the fact that if base are same and there is division, there will be subtraction in power(subtracting since that denominator when goes up, its power gets negated(gets negative sign to the existing power)

Thus,

a^b \timesa ^c = a^{b+c}\\\\\dfrac{a^b}{a^c} = a^{b-c}

<h3>Using above method to simplify the given expression before evaluating</h3>

The given expression is \dfrac{2m^{-1}n^5}{3m^0n^4} = \dfrac{2n^5}{3m^0m^1n^4} = \dfrac{2n^5}{3mn^4} = \dfrac{2n^{5-4}}{3m} = \dfrac{2n^1}{3m} = \dfrac{2n}{3m}

Putting m = -5 and n=3, we get:

\dfrac{2\times 3}{3 \times -5} = -\dfrac{2}{5}

Thus,

The value of the given expression when m = -5 and n= 3 is -\dfrac{2}{5}

Learn more about base and exponent(power) here:

brainly.com/question/847241

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