A math class consists of 10 girls and 8 boys. The teacher wants to choose 2 girls and 2 boys to go on a trip. How many different groups could the teacher choose?

A) 3060
B) 5040
C) 1260
D) 73

Geometry ? i don't know how to do any of these.

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

Use set builder notation to represent the following set: { -3, -2, -1, 0}