How would you write this as an algebraic expression? 49 increased by by twice a number.

You need to focus on the key words in the problem.

Increased = go up, add.

Twice = two times, double.

A number = an unknown number which can be represented by a variable, usually x.

Now that you know the meaning of the key words you can read the problem differently. "49 add by two times x"

When you change your words into operations (+ - x /) you get 49+2x (Remember that when a known number is right next to a variable it means to multiply, times).