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AleksAgata [21]

3 years ago

6

Marcy can make 3 potholders and 8 paper flowers in a day. The following expression, (3 * 2.50 + 8 * 1.25)d represents how much M

arcy can earn in d days. Use the Distributive Property to write an expression equivalent to this expression. (3 * 2.50 + 8 * 1.25)d =

1 answer:

frutty [35]3 years ago

8 0

Answer:

(3 * 2.50 + 8 * 1.25) d =

3*2.50 d + 8*1.25 d

or

7.50 d + 10 d

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Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in

liberstina [14]

The 9th percentile of the bill amounts is 81.0634.

<h3>How to calculate the percentile?</h3>

Population mean, µ = 110.56

Population standard deviation, σ = 22

a) p = 0.09

Z score at p = 0.09 using excel = NORM.S.INV(0.09) = -1.3408

Value of X = µ + z*σ = 110.56 + (-1.3408)*22 = 81.0634

9th percentile = 81.0634

b) p = 0.66

Z score at p = 0.66 using excel = NORM.S.INV(0.66) = 0.4125

Value of X = µ + z*σ = 110.56 + (0.4125)*22 = 119.6342

66th percentile = 119.6342

c) Median = 0.50

Z score at p = 0.5 using excel = NORM.S.INV(0.5) = 0

Value of X = µ + z*σ = 110.56 + (0)*22 = 110.56

Median = 110.56

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5 0

2 years ago

What is the answer to 45 times 61

mihalych1998 [28]

The answer is 2745

so 5x1= 5 5x6=30 so that is 305
4x1=4 4x6=24 so that is 2440
and 305+2440 = 2745

5 0

3 years ago

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Aneli [31]

The answer is D- 512

6 0

3 years ago

Jimmy owns a small engine repair business. The revenue, in dollars, can be modeled by the equation y = 420 + 72x, where x is the

kozerog [31]

Answer:

5 hours

Step-by-step explanation:

Given

$y = 420 + 72x$ --- Revenue

$y = 24x^2 + 180$ --- Overhead cost

Required

Determine the hours for break even

To do this, we simply equate both expressions as follows:

$24x^2 + 180 = 420 + 72x$

Collect Like Terms

$24x^2 - 72x + 180 - 420 = 0$

$24x^2 - 72x -240 = 0$

Divide through 24

$x^2 - 3x - 10 = 0$

Expand:

$x^2 -5x + 2x -10 = 0$

Factorize:

$x(x -5) + 2(x -5) = 0$

$(x + 2)(x -5) = 0$

$x + 2 = 0\ or\ x - 5 = 0$

$x = -2\ or\ x = 5$

But x can't be negative because it represents time.

<em>So, x = 5 hours</em>

3 0

3 years ago

iragen [17]

Answer:

2.95

Step-by-step explanation:

7 0

3 years ago

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