Given that bc is tangent to circle a what kind of triangle is it,

Charles is on a 8 1/2 mile bike ride. he stops for a rest after he’s gone 5 2/5 miles. how much farther does he still have to go?

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?