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vlada-n [284]
3 years ago
7

Mrs. Lynch has noted that 7 out of every 10 pieces of mail she gets are junk mail. What percent of her mail is junk?

Mathematics
2 answers:
-BARSIC- [3]3 years ago
8 0
I think it would be 70% of her mail
VikaD [51]3 years ago
5 0

Answer:

70%

Step-by-step explanation:

Any thing out of ten would be any ten out of a hundred. Just move the decimal back two places and you get 70%

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400 thousands + 600 thousands in standard form​
ruslelena [56]

Answer: 1 million

Step-by-step explanation:

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3 years ago
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Circumference if a circle with a diameter of seven
Dmitry_Shevchenko [17]

Answer:

Circumference = 2 x pi x r

Radius, r = 7/2

Circumference = 2 x 22/7 x 7/2

                         = 22 cm

5 0
2 years ago
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Need help ASAP!<br> I know I am dumb..<br> But..<br> 3/7=?/28 What is the ? mark?
Nookie1986 [14]

Answer:

12

Step-by-step explanation:

write it out:

3/7 x x/28

cross-multiply and solve:

3*28 and 7x

3 x 28 = 84

make an expression:

84 = 7x

solve the expression:

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3 0
3 years ago
Suppose you write a book. The printer charges $4 per book to print it, and you spend $3500 on advertising. You sell the book for
Vesna [10]

Answer:

I must sell more than 318 copies so my revenue is greater than my costs

Step-by-step explanation:

The cost function (C(x)) is divided in two: fixed costs and variable costs. In this case, we have both, the fixed costs are $3,500 that I will spent on advertising and the variable cost is the print cost that depends on the number of books i want to print. The cost function is:

C(x)= $3,500+$4x

The revenue function depends on the number of books I sell:

R(x)= $15x

If i want to know how many books I should sell to have a greater revenue than cost i must solve this inequality:

Revenue (R(x))>Cost (C(x))

$15x>$3,500+$4x

$15x-$4x>$3,500

$11x>$3,500

x>$3,500/$11

x> 318,18

I must sell more than 318 copies so my revenue is greater than my costs

7 0
3 years ago
I need help on this question. Write an equivalent expression. (x + 7) + 3y
Mandarinka [93]
(x+7)+3y = 
x+7+3y = 
2x+14+6y
6 0
3 years ago
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