How much does 3.75 kg of chocolate cost if 0.7 kg of it costs $4.20?

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1