How do you do an expression that doesn't have a number outside the parentheses?

Find the length of cu, the triangles are similar.

Data was collected on myrtle beach for 11 consecutive days. each day the temperature and number of visitors was noted. the scatter plot below represents this data. how many people visited the beach when the temperature was 84 degrees?

Manuela solved the equation below. what is the solution to manuela’s equation?