Solve for x: −2(x + 3) = −2(x + 1) − 4

2

3

all real numbers

no solution



question 2 (multiple choice worth 1 points)

a social networking site recorded that 80% of the people who became members of the site one month were between 30 and 40 years old. the equation below represents this information, where x represents the total number of people who became members of the site that month.

x = 0.8x + 72

how many people who became members of the site that month were between 30 aand 40 years of age?

112

288

360

432

So here are the solutions to your given questions above:
For question 1:
Based on the given values, let us try to expand it.
And the result would be -2x-6 = -2x-6.
This makes the solution would be all real numbers. When we say the solution is all real numbers, isolate the x term by subtracting x from both sides and you end up getting "2=2", which makes it a true statement, and therefore, the solution of the equation is all real numbers.
For question 2:
Since the equation is already given and x represents the number of people who joined the site that month, let us solve for x.
x = 0.8x + 72
x - 0.8x = 72
0.2x = 72
x = 72/0.2 = 360
The number of people who became a member of that month is 360 in total.
Since 80% of it are ages 30 to 40 years old, we are going to find 80% of 360 and that would be 288. So the answer is the second option.

Understanding what? lol