Find the number of distinct triangles with c= 7 b=11 and b= 21 degrees

a.
0
b.
1
c.
2
d.
cannot be determined

How do you solve a question like this?

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

At store a, erasers are sold individually. the cost y of x erasers is represented by the equation y=0.75x. the costs of erasers at store b are shown in the graph.