MATHEMATICS MIDDLE SCHOOL

Simplifying Variable Expression

Answers

Answer 1
Answer: x + 3 • ( 10 + y ) - 7x - 4
x + 30 + 3y - 7x - y
x - 7x + 3y - y + 30
-6x + 2y + 30

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A circle has an diameter of 153.86. What is the diameter?

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153.86
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mary has 50 earring boxes. the boxes measure 1 inch on each side. how many rectangular prisms, each with a different sized base, could mary make by stacking all of the earring boxes?

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Given:
50 earring boxes
1 inch on each side

Volume = a³ = (1 in)³ = 1 in³
1 in³ x 50 boxes = 50 in³

Let us do a prime factorization:
50 ÷ 2 = 25
25 ÷ 5 = 5

1 x 2 x 5 x 5

probable dimensions of the rectangular prisms

height x width x length
1 x 1 x 50
1 x 2 x 25
1 x 5 x 10

The can make 3 rectangular prisms based on the probable dimension.
 

it is estimated that an iceberg weighs 84000 tonnes. As the iceberg moves into the warmer water, it's weight decreased by 25% each day. What will the iceberg weigh after 3 days in the warmer water? Give your answer to 3 significant figures.

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The iceberg will weigh 35000 tonnes correct to 2 significant figures.

What is Depreciation?

Depreciation refers to when the value of something goes down over time. The value of a car usually decreases in value with time. Therefore, its value is said to depreciate.

Given that, it is estimated that an iceberg weighs 84000 tonnes. As the iceberg moves into the warmer water, its weight decreased by 25% each day.

Depreciates by 25%, so 100% - 25% = 75%

75% of, 84000 for 3 days:

= (75 / 100)³ × 84000

= (0.75)³ × 84000

= 35437.5

Therefore, the iceberg will weigh 35000 tonnes correct to 2 significant figures.

For more references on Depreciation, click;

brainly.com/question/15085226

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the iceberg will weigh 35437.5 tonnes after 3 days 

Need help pls
we use a+b+c equations barely today HELP PLS IM LOST

Answers

The answer:  59° .
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Explanation:
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 a + b +  c = 180 .

(in which, "a" , "b", and "c" represent the measurements (in degrees" of each of the THREE (3) angles in a triangle; which always add up to "180 degrees");
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Given "a = 65 degrees";  "b = 56 degrees"; Find "c" (the measurement of the "unknown" angle.).
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 a + b + c = 180 ;

65 + 56 + c = 180 ;  Solve for "c" .
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  180 - (65 + 56)  = c  ;
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Note:  65 + 56 = 121 ;
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So:  180 - (65 + 56)  = 180 - 121= 59 = c ;  ↔  c = 59 .
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The answer:  59° .
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28. The cost c per person to participate in a guided mountain biking tour depends on the number of people n participating in the tour. This relationship can be described by the function c = -3n + 60, where 0 < n < 12. What is the rate of change described by this function? A 20 people/tour C $20 per person B -3 people/tour D -$3 per person

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D- $3 per person because C=-3n+ 60 where 0<n <12 is have a rate of change of -$3 for each person.

Each part of a race is 1/10 mile marker finished 5 parts of the race how far did Marshall race

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A half mile bc 1/10•5 = 5/10& thats 1/2
5/10=1/2=0.5 these are the same answer but in different for the first is the original the second is the reduced form and the third is the decimal hope this helps hope i am brainliest i need one more 
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