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11111nata11111 [884]
4 years ago
13

A bookstore had 90 copies of a magazine. Yesterday, it sold 1/6 of them. Today, it sold 1/5 of what remained. How many copies do

es the bookstore have left
Mathematics
1 answer:
MA_775_DIABLO [31]4 years ago
6 0

Answer:

60 copies

Step-by-step explanation:

first you take 1/6th of the original 90 copies which is 15 and subtract that from the 90, you are left with 75 copies which is how many they had left at the end of yesterday. then you take 1/5th of the 75 copies that are left which is also 15 and you subtract that from 75 and you get 60. that's why at the end of today there are 60 copies left.

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Diane cut 2 1/4 feet of tape. How much is this in inches?
Fantom [35]

Answer:

27 inches

Step-by-step explanation:

1 foot = 12 inches

2 1/4 * 12

2.25 * 12 = 27 inches

Hope this helps!

7 0
2 years ago
Read 2 more answers
What is the arithmetic sequence of a1=228 n=28 sn=2982
Art [367]

Answer:

use the formula sn= n(a1+an)/2

Step-by-step explanation:

2982=28(228+an)/2

5964=28(228+an)

5964/28=228+an

213=228+an

an=-15(last term)

to find difference use formula

an = a+(n-1)d

-15=228+(28-1)d

-243=27d

d=-243/27

d=-9

arithmetic sequence  can be found be keep on subtracting 9 from 228

hence the arithmetic sequence is

228, 219, 210, 201, 192, 183, 174........-15

3 0
3 years ago
Given a circle with measures of (C, d, and r) and a circle with measures of (C', d', and r'), what is r' if C C' = 3.0 and d = 1
RUDIKE [14]
Your answer is 15.0. i truly hope this helps

6 0
3 years ago
Read 2 more answers
Formúla General <br>a) 4x²=9x-2=0 <br><br>b) X²+8x-84=0<br>​
makkiz [27]

Answer:<em> </em><em>a)</em> x=\dfrac{-9 \pm\sqrt{113} }{8}

             <em> b) x₁ = - 14; x₂ = 6.</em>

Step-by-step explanation:

a) 4x² + 9x - 2 = 0

x=\dfrac{-b \pm \sqrt{b^{2}-4ac } }{2a} \\\\a=4; \: \: b=9; \: \: c=-2\\x =\dfrac{-9 \pm \sqrt{9^{2}-4 \cdot 4 \cdot (-2) } }{2 \cdot 4} =\dfrac{-9 \pm\sqrt{113} }{8}

b) x² + 8x - 84 = 0

x=\dfrac{-b \pm \sqrt{b^{2}-4ac } }{2a} \\\\a=1; \: \: b=8; \: \: c=-84\\\\x =\dfrac{-8 \pm \sqrt{8^{2}-4 \cdot 1 \cdot (-84) } }{2 \cdot 1} =\dfrac{-8 \pm\sqrt{400} }{2}=\dfrac{-8 \pm 20}{2} =-4 \pm 10\\\\x_{1} =-14\\x_{2} =6

7 0
3 years ago
(1/4) to the -4 power
GalinKa [24]
The answer would be -1/32 i think.
5 0
3 years ago
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