How to write 9/18 into a equivalent fraction

See attachment below and find the equivalent of tan(∠qsr)

An ice cream shop sells 5 times as many cakes cones as waffle cones. use x to represent the number of waflle cones the ice cream shop sells and use the variable to write an expresion for the number of cake cones the ice cream shop sells. enter the expression for the number of cake cones the the ice cream shop sells

Given the equation −4  = 12, solve for x and identify if it is an extraneous solution.