4 more then three times a number is at least 20

Question

Write an algebraic expression for eaxh of the following

Answer 1

"Four more than three times a number is at least twenty."

The first step to solving this problem is understanding two things: what it's telling you, and what it's asking you. This problem asks us to write an algebraic expression, and then it tells us some words that can reveal our next steps.

"Four more than" - What operation does "four more than" suggest? Addition.

"three times a number" - What operation does "three times a number" suggest? Multiplication. (Also, "a number" suggests an unknown quantity)

"at least twenty" - What does this suggest? That the total is twenty or more; that is, the total is greater than or equal to twenty.

Now we can put it together:

Four more than three times a number is at least twenty = 4 + 3x ≥ 20.

Answer 2

1. Let's start with the multiplication! 3n is equivalent to 3 times a number x.
2. 4 more than the 3n is 3n+4.
3. Use  ≥ for at least, so 3n+ 4 ≥ 20.

Answer 3

Above equation reads 3x + 4 is less than or equal to 20, or at most 20.

It should be:

3x + 4 ≥ 20

Answer 4

4 more means +4

than three times a number is 3x

is at least 20 means

20 ≥ 3x + 4

Answer 5

1. Three times a number n is 3n
2. Add four, you get 3n+4
3. at least is 3n+ 4 ≥ 20