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andriy [413]
3 years ago
5

As part of a school contest, Sarah and Luis are playing a math game. Sarah must pick a number between 1 and 50 and give Luis clu

es so he can write an equation to find her number. Sarah says, "If i subtract 5 from my number, multiply that quantity by 4, and then add 7 to the result, i get 35." What equation can Luis write based on Sarah's clues and what is Sarah;s clues and what is is Sarah's number?
Mathematics
2 answers:
RSB [31]3 years ago
8 0
Simple, writing an equation,

(x-5)*4+7=35

multiply the 4 in

4x-20+7=35

4x-13=35

add 13 to the other side

4x-13=35
     +13  +13
4x=48

x=12.

The number is 12. But to check it, substitute the 12 into the equation.

(12-5)*4+7=35

(7)*4+7=35

28+7=35

35=35.

Thus, your answer is , the number is 12.
iren [92.7K]3 years ago
3 0
11 is the number because I subtracted 7 and 35 it was 28 then divided 28 and 4 which is 6 then added 6 and 5
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Answer:

Step-by-step explanation:

Given that a company fixed costs are 400 dollars

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At break even units selling price = variable cost

1500-0.25x=0.8x+1420\\1.05x = 80\\x=76.19~76

Break even units = 76

b) Revenue = Sales - total costs

= x(1500-0.25x)-(x)(0.8x+1420)-400\\= 1500x-0.25x^2-0.8x^2-1420x-400\\= -1.05x^2+80x-400

Use derivative test to get max revenue

R'(x) = -2.10x+80

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x=38.10

x=38

c) price when x =38 is

P = 1500-0.25(38)\\=1490.5

5 0
3 years ago
Sam is using the expression m/8n in class. what is the value of the expression when m = 4 and n = 1/2?
7nadin3 [17]

Answer:

1

Step-by-step explanation:

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Irina-Kira [14]

Big Rectangle : Small Rectangle = 4 : 3


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Positive numbers have negative square roots.
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No, positive numbers have positive square roots.
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