Isolate the variable, x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. PEMDAS is the order of operations, and stands for:

Parenthesis, Exponents (& Roots), Multiplication, Division, Addition, Subtraction.

First, divide 3 from both sides of the equation:

$\frac{(3x^2)}{3} = \frac{(48)}{3}$

$x^{2} = \frac{48}{3}\\ \\x^2 = 16$

Next, isolate the variable, x, by rooting both sides of the equation:

$\sqrt{x^{2} } = \sqrt{16}\\ x = \sqrt{16} = \sqrt{4 * 4}$

x = ±4

C) ±4 is your answer.

5 0

2 years ago

Which matrix can be used to solve the system?

Brut [27]

It's the last choice. In the top row you have the 1's that are the coefficients on the x and the y, and the solution for that equation is 21; in the second row you have the 5 from the x and the 4 from the y and the solution for that equation which is 20. I'm more used to writing them down instead of across, but there you have it anyways

4 0

3 years ago

1 The formula for the area of a triangle is

katrin [286]

Answer:

The formula of area of triangle= ½ base×height

7 0

3 years ago

Read 2 more answers

At a party there are 30 students over the age of 21 and 15 under the age of 21. You select a representative sample of 5to interv

Feliz [49]

Answer:

Stratified sampling

Step-by-step explanation:

Given

$30 \to 21\ and\ above$

$15 \to Under\ 21$

Required

The type of sampling method

From the question, we understand that, the sample are divided into two categories. This means that each person in each person do not have the same probability of being selected.

<em>Such method is a stratified sampling</em>

7 0

2 years ago