Of the 15-year-olds at a karate school, 7 have black belts and 10 have brown belts. among the 16-year-olds, 10 have black belts and 19 have brown belts. which age group has a lower ratio of black belts to brown belts?

3× __ -2=15 7 2× __+1=7 5 7× =22 15 5× __+10=2 8 × __+4=20 6 × =10 3 × __+2=8 6 × __+8=8 9 × __+7=20 6

Which value is not a solution of 8x^3 – 1 = 0

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?