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muminat
2 years ago
7

Mary read 2/5 of a book in 15 minutes. How much of the book can she read per hour? book per hour.​

Mathematics
2 answers:
Yuliya22 [10]2 years ago
8 0

Answer:½((n/2) – ½) – ½ = 10

½(n/2) – ¼ - ½ = 10 (using the distributive property)

¼n – ¼ - ½ = 10 (multiplying to eliminate the parentheses)

¼n – ¾ = 10 (combining like terms)

¼n = 10¾ (adding ¾ to both sides of the equation)

n = 43 (dividing both sides of the equation by ¼)

Step-by-step explanation:

Let’s start by writing Josie’s first step as an expression. Dividing n by 2, then subtracting ½ from

the result would be (n/2) – ½. If we build on this expression with the information in Josie’s

second step, we get ½((n/2) – ½) – ½. Knowing the final result is 10, we can set up the equation

below, and solve for n as follows: hope this helps

Vika [28.1K]2 years ago
3 0

Answer:

Mary can read 8 pages in an hour

Step-by-step explanation:

60/15 = 4

2/5 x 4

2/5 x 20/5

40/5 = 8

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hoa [83]
We need to remember that:
                   xyz = (x)(y)(z)
if x, y and z are perfect cubes, then xyz would also be a perfect cube

Also, 
                 (x^n)^m = x^(mn)
if it is a perfect cube, then it can be factored into the expression (x^n)^3, wherein n is a whole number.

All should be a perfect cube, given

215x^18(y^3)(z^21)

By writing the terms separately, we would see which one is to be changed. 

215 = 5*43, we see this is not a perfect cube, we could changed it to 6^3 or 216

x^18=(x^6)^3

y^3=y^3
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The other terms are perfect cubes except for the first one. So the correct answer would be the last option, 215 should be changed.
4 0
3 years ago
Read 2 more answers
10. Consider the diagram below.<br> A. solve for x<br> B. Solve for y
anastassius [24]

Answer:

x=42 y=38

Step-by-step explanation:

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8 0
3 years ago
Find the value of n<br><br><br><br><br>1) 15/40 =n/3​
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Answer:

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Step-by-step explanation:

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(Use Cross Product)

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7 0
3 years ago
on our way to visit her parents Jennifer Drive 265 miles in 5 hours what is the average rate of speed in miles per hou
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