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lilavasa [31]
3 years ago
14

Answer both? please?

Mathematics
1 answer:
lesya [120]3 years ago
6 0

Answer:

19. 83/8

20. A rational number is a number that can be express as the ratio of two integers. A number that cannot be expressed that way is irrational. Any number that can be written in fraction form is a rational number. This includes integers, terminating decimals, and repeating decimals as well as fractions. An integer can be written as a fraction simply by giving it a denominator of one, so any integer is a rational number.

Step-by-step explanation:

19. 2 1/2 + 3 1/8 + 4 3/4 = 83/8 or 10.375 or 10 3/8

20. A rational number is a number that can be express as the ratio of two integers. A number that cannot be expressed that way is irrational. Your answer for 19 is rational

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A scientist estimated that a mixture would need 4 milliliters of a chemical to balance. The actual amount needed was 7 millilite
Butoxors [25]

42.86% error was in the scientist's estimation.

Step-by-step explanation:

Given data;

Approx amount = 4 ml

Exact amount needed = 7 ml

Percentage error = \frac{|Approx-Exact|}{Exact}*100

Percentage\ error=\frac{|4-7|}{7}*100\\Percentage\ error=\frac{|-3|}{7}*100\\Percentage\ error=\frac{3}{7}*100\\\\Percentage\ error=\frac{300}{7}\\Percentage\ error= 42.86\%

42.86% error was in the scientist's estimation.

Keywords: error, percentage

Learn more about percentages at:

  • brainly.com/question/4694425
  • brainly.com/question/4695279

#LearnwithBrainly

6 0
3 years ago
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Gustav needed to bake at least 252 cookies for the luncheon. He baked 8 batches of peanut butter cookies with 12 cookies in each
spin [16.1K]

Answer:

He made 10.4 batches of chocalate chip cookies.

He made 156 chocalate chip cookies and 96 peanut butter cookies.

Step-by-step explanation:

Sense there's a total of 252 cookies you would subtract the 96 cookies from 252 to get 156 then divide it by 15 to get 10.4 which is how much batches he made of chocalate chip cookies.

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Simplify the expresssion 2x^2+8+3x^2+4x-10
nignag [31]

Answer:

x= 0.348 OR X= -1.148

Step-by-step explanation:

Given that:

2x^2+8+3x^2+4x-10

The first step is to rearrange the parameters given, by doing so, we have:

= 2x^2 +3x^2 +4x -10+8

= 5x^2 +4x - 2

The above equation forms the basis of a quadratic equation;

So using quadratic formula

= (-b +/- (√b^2-4ac))/2a

= (-4 +/- (√4^2 -4*5*(-2))/2*5

= -4 +/- (√ 16 - (-40))/10

=( -4 +/- √ 56 ) / 10

=( -4 +√ 56 ) / 10 OR =( -4 - √ 56 ) / 10

= (-4 + 7.48)/10 OR (-4 -7.48)/10

= 3.48/10 OR -11.48/10

= 0.348 OR. -1.148

SO, x= 0.348 OR X= -1.148

4 0
3 years ago
5-2(m-3)=1 can y’all help me this is hard
Naddik [55]

Answer:

m = 5

Step-by-step explanation:

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5 - 2m + 6 = 1

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m = 5

3 0
3 years ago
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