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elena-s [515]
2 years ago
12

The Taylors have recorded their weekly grocery expenses for the past 12 weeks and determined that the mean weekly expense was ​$

.82.55. Later Mrs. Taylor discovered that one​ week's expense of​ $74 was incorrectly recorded as​ $47. What is the correct​ mean?
Mathematics
1 answer:
SVETLANKA909090 [29]2 years ago
4 0

Answer:

$84.80

Step-by-step explanation:

find the difference between accurate price and written price: 74 - 47 = 27

find written total (before Mrs. Taylor found mistake) by undoing the mean calculation: 82.55 x 12 = $990.60

the total expenses is $27 more than what they thought: 990.60 + 27 = 1017.60

divide accurate total by 12 to find mean: 1017.60 / 12 = $84.80

hope this helps :)

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Simplify 3x + 5 + 7 x - 3 - x + 2​
stira [4]

Before we do this problem, let's go over a little algebra terminology.

The number in front of your variable is called your <em>coefficient </em>and notice that the <em>x</em> at the end of the problem does not have a coefficient.

When that happens, when there is no number in front of your variable, you can put a 1 there to fill that position. So -x can be thought of as -1x.

Next let's change all our minus signs to plus negatives.

So the problem reads 3x + 5 + 7x + -3 + -1x + 2.

Now let's simplify this by combining like terms.

We can combine our "x" terms first.

3x + 7x + -1x simplifies to +9x.

Now, 5 + -3 + 2 simplifies to 4.

So our answer is 9x + 4.

8 0
2 years ago
Read 2 more answers
Gail ran 4610 miles on Saturday and 6810 miles on Sunday. How many miles did Gail run over the weekend?
VMariaS [17]

Answer:

He ran 11,420 miles on the weekend.

Step-by-step explanation:

It's simple: add 4610 and 6810 to get 11,420

hope this helped!

8 0
2 years ago
Can someone pls help
Liono4ka [1.6K]

Answer:

A

Step-by-step explanation:

I honestly dont know the step by step process but im pretty sure its A

7 0
2 years ago
What's a number between 67 and 113 that is a multiple of 3,4 and 9
Pachacha [2.7K]
 72 is a number between 67 and 113 that is a multiple of 3, 4, and 9. 

72/3= 24 

72/4= 18 

72/9= 8
7 0
3 years ago
The graphs show the amount of sugar in two kinds of juice.
gizmo_the_mogwai [7]

Answer:

Pat a) The unit rate of graph at left is 25\ \frac{grams}{cup}

Part b) The unit rate of graph at right is 40\ \frac{grams}{cup}

see the attached figure

Step-by-step explanation:

we know that

The unit rate of a linear equation is the same that the slope of the linear equation

step 1

Find the slope of the graph at left

This graph represent a proportional relationship (because the line passes through the origin)

The slope is equal to the constant of proportionality k

k=\frac{y}{x}

we have the point (1,25)

substitute the values in the formula

k=\frac{25}{1}=25\ \frac{grams}{cup}

step 2

Find the slope of the graph at right

we have the points (2,80) and (3,120)

This graph represent a proportional relationship (because the line passes through the origin)

The slope is equal to the constant of proportionality k

k=\frac{y}{x}

Is necessary only one point to determine the constant of proportionality

take the point (2,80)

substitute the values

k=\frac{80}{2}=40\ \frac{grams}{cup}

<u>Verify</u>

The formula to calculate the slope between two points is equal to

m=\frac{y2-y1}{x2-x1}

we have the points (2,80) and (3,120)

substitute the values

m=\frac{120-80}{3-2}

m=\frac{140}{1}=40\ \frac{grams}{cup}

8 0
3 years ago
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