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DochEvi [55]
3 years ago
11

Michael sold 23 of his CDs and purchased 16 more. If Michael has 25 CDs now, how many CDs did he have to begin with?

Mathematics
1 answer:
olga_2 [115]3 years ago
6 0
The correct question is
<span>Michael sold 2/3 of his CDs and purchased 16 more. If Michael has 25 CDs now, how many CDs did he have to begin with?

Let
x--------------> numbers of CDs Michael have to begin

if Michael sold (2/3)x-----------> </span><span>are pending to sell (1/3)x

we know that
(1/3)x+16=25--------> </span>(1/3)x=25-16-------> (1/3)x=9---------> x=27

the answer is 27 CDs

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5 0
3 years ago
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Answer:

7. 1520.53 cm²

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Step-by-step explanation:

Recall:

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Surface area of hemisphere = 2πr² + πr²

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Plug in the value into the appropriate formula

Surface area of the sphere = 4*π*11² = 1520.53 cm² (nearest tenth)

8. r = ½(8.6) = 4.3 ft

Plug in the value into the appropriate formula

Surface area of the sphere = 4*π*4.3² = 232.35 ft² (nearest tenth)

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Plug in the value into the formula

Surface area of hemisphere = 2*π*9.1² + π*9.1² = 520.31 + 260.15

= 780.46 m²

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Plug in the value into the formula

Surface area of hemisphere = 2*π*14² + π*14² = 1,231.50 + 615.75

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