Let's move the terms with n to one side:
12n < 3n + 28 => 12n - 3n < 28
9n < 28 => n < 28/9
n < 3.1111
The only answer which satisfies this inequality is A.

5 0

3 years ago

If the mean of five values is 9.6 and four of the values are 8, 14, 7, and 13, find the fifth value.

Keith_Richards [23]

Answer:

The missing value is 6

Step-by-step explanation:

We know that there are 5 values but only 4 are given:

⇒ The given values are: 8, 14, 7, and 13

⇒ Let the fifth value be "x"

We also know the mean which is 9.6

Solve for the missing value:

⇒ 9.6 (mean) = $\frac{8 + 14 + 7 + 13 + x}{5 numbers}$

multiply 5 on both sides

⇒ 9.6 x 5 = $\frac{8 + 14 + 7 + 13 + x}{5 numbers}$ x 5

⇒ 48 = 8 + 14 + 7 + 13 + x

add the numbers:

⇒ 8 + 14 + 7 + 13 + x = 42 + x

the equation becomes:

⇒ 48 = 42 + x

Now, subtract 42 on both sides:

⇒ 48 - 42 = 42 - 42 + x

⇒ 6 = x

5 0

3 years ago

WILL GIVE 100 POINTS

Brut [27]

Answer:

thats clearly 50 bt okay

Step-by-step explanation:

4 0

3 years ago

City planners are designing a new dog park. The park will be a square. The area of the park is the square of the side length: ar

larisa86 [58]

Step-by-step explanation:

A = 280² ft²

A = (200 + 80)² ft²

A = [200² + 2(200)(80) + 80²] ft²

A = (40000 + 32000 + 6400) ft²

A = 78400 ft²

7 0

3 years ago