1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Anna11 [10]
3 years ago
13

Use the table to write and solve an equation to find the number of

Mathematics
1 answer:
exis [7]3 years ago
4 0

Answer:

c = 11

Step-by-step explanation:

Given

Cars\ Sold:-: 8; 9; 12; c

Required

What value of c makes the mean = 10

Mean is calculated as

Mean = \frac{\sum x}{n}

In this case;

Mean = 10 and n = 4;

So, we have:

10 = \frac{8+ 9 + 12 + c}{4}

10 = \frac{29+ c}{4}

Multiply both sides by 4

10 * 4 = 29 + c

40 = 29 + c

Solve for c

c = 40 - 29

c = 11

You might be interested in
If the expression x-3 has a value of -5,then which of the following represents the value of 3x-9
Angelina_Jolie [31]

Answer:

-15

Step-by-step explanation:

<em>Italics</em> by itself are comments, <em>italics</em> and <u>underlines</u> are helpful rules, bold highlights little facts.

x-3=-5 : since the expression 'x-3' is being assigned the value '-5'

We then isolate or leave the variable 'x' on one side, usually the left-hand side and move all constants (numbers without letters attached such as 3, 4, 5..etc.) and variables (letters such as x, y, a, b..etc.) that do not have 'x', to the right-hand side of the equality symbol (=). This also includes terms such as 5x, -2y, 50z..etc.

<em><u>(Remember that the opposite of multiplication is division and vice versa and the opposite of addition is subtraction and vice versa)</u>.</em>

To do that, we add 3 to both sides of the equation, because the opposite of subtraction is addition <em>(in this case 3 is being subtracted by x, therefore in order to cancel 3 on the left, we do the opposite of the operation).</em> By doing this, we effectively cancel 3 on the left and bring it to the right-hand side. After all, 3 cannot be in two places at once <em>(well not in this equation).</em>

x=-5+3 which is equal to -2.

Hence, x=-2

Now that we know what 'x' is we can work on the other expression: 3x-9

Substitute the value for 'x' (-2 is what we got) into the 'x' in the expression.

3(-2)-9=?

<em><u>(Remember that a positive number multiplied by a negative number will ALWAYS be a negative number. In other words, (+) × (-) = (-). Yes, this also includes a negative number multiplied by a positive number)</u>.</em>

Therefore, 3×(-2) will equal -6.

-6-9=-15

Hence, 3x-9=-15.

To make sure your answer is correct, do the equation backwards. Add 9 to -15 which would then give you -6.

Here's how that looks: 3x-9 (+9)= -15 (+9).

You would then be left with 3x=-6.

If you remembered the rule typed previously, I said in order to isolate 'x' we do the opposite of the operation. 3x means '3' multiplied by 'x', therefore the opposite of multiplication is division:

3x(÷3)=-6(÷3) ----> 3 divided by 3 equals 1. Anything multiplied by 1 will be equal to itself (x*1= x)

<em><u>(An asterisk can also symbolise multiplication).</u></em>

Therefore when 3x is divided by 3, the constants would cancel each other out, 1 would be left looking like this: 1x=... and 1x is the same as x by itself.

-6 divided by 3 is equal to -2 <em><u>(a positive divided by a negative will always be negative and vice versa)</u></em>.

Hence, x=-2.

8 0
3 years ago
A function for the cost of renting a snow blower is $13.50 per hour.
jekas [21]

1= $13.50

2= $27

3=$40.50

I Don't Know How The Hour You Looking For?


3 0
3 years ago
PLZ HELP ASAP<br><br>The scale factor of ____ was applied to the first triangle
pashok25 [27]

The scale factor of 4 was applied to the first triangle. 6 was divided by 4 to get 1.5

5 0
3 years ago
PLZ SOLVE PIC ATTACHED BELOW
ludmilkaskok [199]

Answer:

\tan(51°)  =  \frac{10}{x}  \\x =  \frac{10}{ \tan(51°) }  \\ x = \frac{10}{1.235}  \\ \boxed{ x = 8.1}

<h3>★ Value of x is <u>8.1</u>.</h3>

\sin(51°)=  \frac{10}{H}  \\ h =  \frac{10}{ \sin(51°) }  \\ H=  \frac{10}{0.777}  \\  \boxed{H= 12.8676}

<h3>★ Value of H is <u>12.8676</u>.</h3>

Remember:

  • tan∅=Perpendicular/Base
  • sin∅=Perpendicular/Hypotenuse

4 0
2 years ago
4x+6&lt;-6 how to solve
Salsk061 [2.6K]

Answer:

The answer is below.

Step-by-step explanation:

4x<-6-6

4x<-12

x= -3

Inequality form:

x< -3

Interval Notion:

(-8,-3)

Note: Turn the -8 on the sideways on the right, because its not 8.

8 0
2 years ago
Read 2 more answers
Other questions:
  • ANSWER PLZ QUICK AND FAST
    12·1 answer
  • PLEASE HELP ME WITH THIS QUESTION!!!
    14·2 answers
  • An airplane takes off 12.5 miles south of a city and flies due north at a constant speed of 170 miles per hour. What is the plan
    8·1 answer
  • A group of 22 students participated in a race. Their scores are below:
    12·2 answers
  • A jewelry store is selling a set of 4 pairs of gemstone earrings for $58, including tax. Neva and three of her friends want to b
    13·1 answer
  • Which of the following formulas would find the lateral area of a right cylinder
    7·1 answer
  • HELP ME PLEAS EILL GIVE BRAINLY!!!!!!
    13·2 answers
  • Can anyone help me ASAP!
    5·2 answers
  • Which representation has the greatest rate of change?
    15·2 answers
  • Please answer this i need helppp
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!