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MariettaO [177]
3 years ago
5

ChitChat wireless charges $0.30 per minute plus a monthly base fee. In september, Maggie used 120 minutes and her bill was $50.

Write and solve an equation to find the cost if Maggie uses 165 minutes in october
Mathematics
1 answer:
Art [367]3 years ago
8 0
Let $k =  the monthly base fee.
The variable cost is $0.30 per minute.

Let
C = total cost in a month
x = minutes used

September:
x = 120 minutes
C = $50
Therefore
k + (0.30)(120) = 50
k + 36 = 50
k = $14

October:
x = 165 minutes
The cost is
C = 14 + (0.3)(165) 
C = $63.5

Answer: $63.50

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The average thickness of books on a library shelf is 8.3 centimeters. The standard deviation is 0.6 centimeter. If 20% of the bo
jeka57 [31]

Answer:

8.8 cm

Step-by-step explanation:

-We know that the top 20% of the books are oversized.

-We therefore find the z-value of the top 20%:

z_{0.1}=8.4

#We substitute the z value in formula to solve X.

z=\frac{\bar  X-\mu}{\sigma}

Where

  • X is the minimum thickness of the book.

-Given \sigma=0.6 \ , \mu=8.3, the minimum thickness,X can be calculated as follows:

z=\frac{\bar  X-\mu}{\sigma}\\\\0.84=\frac{\bar X-8.3}{0.6}\\\\\bar X=0.84\times 0.6+8.3\\\\=8.804\approx 8.8\ cm

Hence, the minimum thickness of the oversized books is 8.8 cm

3 0
4 years ago
A city had population 67,255 on January 1,2000, and its population has been increasing by 2935 people each year since then. A li
bezimeni [28]

It is given in the question that

A city had population 67,255 on January 1,2000, and its population has been increasing by 2935 people each year since then.

Here initial population , b, is 67255, and the rate of increase of population is 2935 people each year. And that's the value of the slope .

Using slope intercept form, which is

y=mx+b

And substituting the values of m and b, we will get

p(t)=2935t +67255

5 0
3 years ago
Create a histogram with five intervals from this data set: 21, 37, 56, 87, 32, 45, 77, 71, 65, 67, 21, 34
dusya [7]

Answer:

The histogram and data are shown in the figures below



5 0
4 years ago
Read 2 more answers
Can someone check these for me? lmk if they are wrong and how to correct them please
Cloud [144]

Answer:

the 1. is y = (5/4)x + 6 and 2 . is y = 20x+10, so you are right, both of them correct

8 0
3 years ago
What is the factorization of the trinomial below?<br> 2x^2-16x+30
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Answer:

2(x²-8+15)

X1/2=8+-(64-60) /2= 8+-2 /2=

10/2=5 or

6/2=3

So the answer is C. 2(x-3)(x-5)

7 0
3 years ago
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