Member • Oct 30, 2011

## Math probs??

1. 12, 13, 17, 26, X, 67, 103. find X. the answer here is 42, but i can't formulate an equation.

2. evaluate (0.7)[SUP]20[/SUP] + (0.7)[SUP]19[/SUP](0.3)(20)....+ (0.7)[SUP]4[/SUP](0.3)[SUP]16[SUP][SUB]20[/SUB]C[SUB]16[/SUB]

3. the arch of an underpass is a semi-ellipse 60ft wide and 20ft high. find the clearance at the edge of a lane if the edge is 20ft from the center.

Thanks again!!ðŸ˜€