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3 years ago

Rebecca wants to buy cupcakes. She can buy 2 for $0.48 or 5 cupcakes for $.1.25. Which is the better buy? Explain your answer.

2 answers:

7 0

To figure this out, you have to find the unit price of both.
The unit price for buying two cupcakes is 24 cents for 1 cupcake.
The unit price for buying 5 cupcakes is 25 cents for 1 cupcake. Therefore, the better buy is to buy two cupcakes. They are one cent less each.

katrin [286]3 years ago

5 0

2 for $0.48 is a better buy. You save 1 cent per cupcake.

There's really not much of a difference though.

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3 years ago

Read 2 more answers

Can someone help me answer 7, 8, and 9. Thank you! I don’t really get the circle concept

Mariulka [41]

Answer:

Part 7) Option C. The approximate perimeter of the patio is $54\ ft$

Part 8) Option G. $3\ floats$

Part 9) $150.72\ minutes$

Step-by-step explanation:

Part 7) we know that

The perimeter of the figure is equal to the circumference of the larger half circle plus the circumference of the smaller half circle plus two times the length of 8 ft

step 1

Find the circumference of the larger half circle

The circumference of the larger half circle is

$C=\pi r$

we have

$r=8+2=10\ ft$

substitute

$C=\pi(10)$

$C=10\pi\ ft$

step 2

Find the circumference of the smaller half circle

The circumference of the smaller half circle is

$C=\pi r$

we have

$r=2\ ft$

substitute

$C=\pi(2)$

$C=2\pi\ ft$

step 3

Find the perimeter of the figure

$10\pi\ ft+2\pi\ ft+2(8)\ ft=(12\pi+16)\ ft$

assume $\pi=3.14$

$(12(3.14)+16)=53.68=54\ ft$

Part 8) we know tat

The area of a circle is equal to

$A=\pi r^{2}$

we have

$A=28.26\ ft^{2}$

assume $\pi=3.14$

substitute the values and solve for r

$28.26=(3.14)r^{2}$

$r^{2}=28.26/(3.14)$

$r^{2}=9$

$r=3\ ft$

Find the diameter D

$D=2r=2(3)=6\ ft$

Divide the width of the pool by the diameter of the floats

$\frac{18}{6}=3\ floats$

Part 9)

step 1

Find the circumference of one coaster

The circumference of circle is

$C=2\pi r$

we have

$r=1.5\ in$

assume $\pi=3.14$

substitute

$C=2(3.14)(1.5)=9.42\ in$

step 2

Find the circumference of 48 coasters

$48(9.42)=452.16\ in$

step 3

we know that

The laser cut woods at the rate of 3 inches per minute

By proportion find how many minutes will it take to cut out 48 coasters

$\frac{3}{1}\frac{inches}{minute} =\frac{452.16}{x}\frac{inches}{minutes}\\ \\x=452.16/3\\ \\x=150.72\ minutes$

4 0

3 years ago

The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 256.3 and a standard deviation of

AnnyKZ [126]

Answer:

a) In the interval ( 55,9 ; 456,7 ) we will find 99,7 % of all values

b) In the interval ( 122,7 ; 389,9 ) we find 95,4 % of all values

Step-by-step explanation:

For a Normal distribution N (μ ; σ ) the Empirical rule establishes that the intervals:

( μ ± σ ) contains 68,3 % of all values

( μ ± 2σ ) contains 95,4 % of all values

( μ ± 3σ ) contains 99,7 % of all values

If N ( 256,3 ; 66,8 )

σ = 66,8 ⇒ 3*σ = 3 * 66,8 = 200,4

Then: 256,3 - 200,4 = 55,9

And 256,3 + 200,4 = 456,7

a) In the interval ( 55,9 ; 456,7 ) we will find 99,7 % of all values

b) 2*σ = 2 * 66,8 = 133,6

Then 256,3 - 133,6 = 122,7

And 256,3 + 133,6 = 389,90

Then in the interval ( 122,7 ; 389,9 ) we find 95,4 % of all values

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3 years ago