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3 years ago

13

A bookstore had 60 copies of a magazine. Yesterday, it sold 1/3 of them. Today, it sold 1/4 of what remained. How many copies do

es the bookstore have left?

1 answer:

lara [203]3 years ago

7 0

Answer:

30

Step-by-step explanation:

1/3 of 60 is 20

40 would be left

1/4 of 40 is 10 so 30 would be left

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In the following table of values, the first differences are

ExtremeBDS [4]

Answer:

-7

Step-by-step explanation:

Given

$\begin{array}{ccc}x & {y} & {First\ difference} & {-2} & {34} & {}&{-1} & {27} & {} &{0} & {20} & {} & {1} & {13} & {} & {2} & {6} &{} \ \end{array}$

Required

The first difference

To do this, we simply calculate the difference between the consecutive y-values.

i.e.

$d = y_{n+1} - y_n$

So, we have:

$d = y_2 - y_1 = 27 - 34 = -7$

$d = y_3 - y_2 = 20 - 27 = -7$

$d = y_4 - y_3 = 13 - 20 = -7$

$d = y_5 - y_4 = 6-13 = -7$

<em>Hence, the first differences are -7 (all through)</em>

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3 years ago

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Fofino [41]

which one ?

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What is the distance between the points (−3, 5) and (−3, −6) ?

tresset_1 [31]

The answer would be D, 11 units! :)

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3 years ago

(y+3) solve by using the distributive property

MA_775_DIABLO [31]

Answer:

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Step-by-step explanation:

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How do you solve: 2(5+r)<br><br><br>A :7+r<br><br>B: 10+2r<br><br>C: 12r<br><br>D: 7+2r

maksim [4K]

Answer:

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Step-by-step explanation:

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