Use euler's formula to find the missing number.
vertices: 15
edges: 24
faces: ?
a. 9
b.10
c.11
d.12

Find the value of x for which the lines are parallel.

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?