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bezimeni [28]
2 years ago
5

The mean of four numbers is 6. Three of them are 3.4,10.7and 7.8. what is the fourth number?​

Mathematics
2 answers:
Marianna [84]2 years ago
8 0

Answer:

2.1

Step-by-step explanation:

Use the equation

Sum of elements = average x number of elements

sum = (6)(4)

sum = 24

Add up the numbers we know: 3.4 + 10.7 + 7.8 = 21.9

24 - 21.9 = 2.1

This means the fourth number is 2.1

iren2701 [21]2 years ago
7 0

Answer:

2.1

Step-by-step explanation:

Let x be the 4th number.  To find the mean add  the 4 numbers and divide by 4

( 3.4 + 10.7+7.8+x) /4 = 6

Multiply each side by 4

( 3.4 + 10.7+7.8+x) /4 *4= 6*4

( 3.4 + 10.7+7.8+x) = 24

Combine like terms

x+21.9=24

Subtract 21.9 from each side

x = 24-21.9

x =2.1

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Answer:

0.7

Step-by-step explanation:

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the price of a new pair of sneakers is $79.95. if sales tax is 7.5%, then approximately, how much tax will be paid on sneakers?
Firlakuza [10]

Answer:

$6

Step-by-step explanation:

Find 7.5% of the sneaker price, by multiplying the price by 0.075:

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3 years ago
Milo's Ice Cream Factory sold more than 45 waffle cones yesterday. Which of the following inequalities represents the number of
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Answer:

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6 0
2 years ago
Read 2 more answers
16x^2 - 49 when factored is ?
vaieri [72.5K]

Answer:

(4x-7)(4x+7)

Step-by-step explanation:

This is called the Difference of Two Squares (DOTS).

These are the conditions that must be met for DOTS to work:

•There must be 2 terms.

•They must be separated by a negative sign.

•Each term must be a perfect square.

First, you have to find 2 square numbers that times together to make 16.

4×4=16

As we want 16x², you just need to make the 4 become 4x:

4x times 4x equals 16x²

Then, find 2 squares that times together to make 49.

7×7=49

You can put the two squares into a bracket with the x variable first, then the number:

(4x-7)(4x+7)

In the brackets, you always put the negative sign in the first one and then the plus sign in the second one.

You can double check your answer by expanding it back out again using FOIL:

F-First

O-Outer

I-Inner

L-Last

Times the First two in the two brackets:

4x times 4x equals 16x²

Times the Outer two:

4x times 7 equals 28x

Times the Inner two:

-7 times 4x equals -28x

Times the Last two:

-7 times 7 equals -49

Form an equation:

16x²+28x-28x-49

The 28x cancel out to leave:

16x²-49

Hope this helps :)

3 0
2 years ago
Difference between dot and cross product
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If you have two vectors A and B,
Dot product is a scalar quantity dealing with how much of one vector is in the same direction as the other vector, or the projection of one onto the other. You can see that from the cosine part of this form-
A~*~B = [A][B]cos(\theta)

The cross product is a vector perpendicular to both A and B. It deals with how much of one vector is perpendicular to the other vector. You can see that in the sine part of this form -
A ~x ~B= [A][B]sin(\theta)


8 0
3 years ago
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