Which expression is equivalent to 15 x^3 z^5/ 3 x^7 z^-5 A 12/x^10
B 5x^4
C 5(x/z)^10
D 5(z/x)^10
E 12(z/x)^10

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

Which fraction represents the ratio 35 : 42 in simplest form

Afarmer has 5 times as many cows as pigs. the farmer only has cows and pigs, and he has 168 animals. how many cows does he have?