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Anna35 [415]
3 years ago
12

PLEASE SHOW THE STEPS TO ALL THE QUESTIONS FOR 20 POINTS!

Mathematics
1 answer:
alexandr402 [8]3 years ago
6 0
2y-7>15
2y> 15+7
2Y > 22
2Y/2>22/2
y > 11
put any number below 11 in the left side it will be less then 15


2x-5> 1
2x > 1 +5
2x > 6
2x/2 > 6/2
x > = 3
put 3 instead of x in the left side it will be equal to the right side or put anything less then 3 then the left side will be less then 1

2x+5>1
2x > 1-5
2x > -4
2x/2>-4/2

x> -2

put -2 instead of x it will be equal to the right side anything less then -2 then it will be less the the right side
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Question 6 of 9 (3•8) • 1 = 3 • (8.1) O A. True B. False​
olga nikolaevna [1]

Answer:

No, (false). The question I assume was: (3*8)*1=3*(8.1)

Step-by-step explanation:

1. Multiple: 3 * 8 = 24

2. Multiple: <em><u>The result of step No. 1:</u></em> * 1 = 24 * 1 = 24

3. Conversion a decimal number to a fraction: 8.1 = \frac{81}{10} = \frac{81}{10}

   a) Write down the decimal 8.1 divided by 1: 8.1 = \frac{81}{1}

   b) Multiply both top and bottom by 10 for every number after the

       decimal point. (For example, if there are two numbers after the decimal

       point, then use 100, if there are three then use 1000, etc.)

       \frac{8.1}{1} = \frac{81}{10}

   Note: \frac{81}{10} is called a decimal fraction.

   c) Simplify and reduce the fraction

       \frac{81}{10} = \frac{81*1}{10*1} = \frac{81}{10}

4. Multiple: 3 * 8.1 = \frac{3*81}{1*10} = \frac{243}{10}

   Multiply both numerators and denominators. Result fraction keep to lowest

   possible denominator GCD(243, 10) = 1. In the next intermediate step the

   fraction result cannot be further simplified by canceling.

   In words - three multiplied by eighty-one tenths = two hundred forty-three

   tenths.

5. Compare: <em><u>The result of step No. 2 </u></em>vs <em><u>The result of step No. 4</u></em>: = 24 vs \frac{243}{10} = \frac{24}{1} vs \frac{243}{10} = \frac{24*10}{1*10} vs \frac{243}{10} = \frac{240}{10} vs\frac{243}{10} = 240 vs 243 = No

5 0
3 years ago
What is the average of all the integers from 17 to 55?
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The average would be 36
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The measure of an interior angle of a regular polygon is 140°140°. find the number of sides of the polygon.
MA_775_DIABLO [31]
\alpha = \cfrac{180(n-2)}{n}  \ \ \ \ \  [ \alpha =interior \ angle, \ \ n=number \ of &#10; \ sides]  \\  \\  \\ 140 = \cfrac{180(n-2)}{n} \\ \\  140n = 180(n-2) \\ \\ 140n=180n-360 \\ \\ 40n=360 \\ \\ n= \frac{360}{40}=9 \ \ sides
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Convert 8 miles into feet and then into inches.
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Answer:

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Step-by-step explanation:

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