HELPPP PLEASE!!Three friends went shopping. They each bought one pair of shoes that cost $20 and 4 shirts that cost x dollars.
1. Write an expression that represents this situation.
2. Simplify the expression.

1.

2.

Step-by-step explanation:

1. Let's just focus on one person at the moment. One of the friends bought a single shirt for $20, and 4 shirts that cost x dollars. Therefore, a single person's expense can be shown as:

Where x is the number of shirts the person bought.

Each of the three friends had the exact same expenses too, so we multiply this by three:

2. Simplifying the above equation just means multiplying each term in the parentheses by the 3 outside it, so 3 times 20 is 60, and 4x time 3 is 12x. Therefore, the simplified expression is:

Hope this helps!

c-4 is the final answer! : )

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.