Two polygons have 20 ribs and 95 diagonals. how many ribs does each polygon have?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu