elements x and j combine to form two binary compounds. the first compound contains 16.80 g of x with 3.50 g of j. in the second compound, 7.20 g of x combines with 4.40 g of j. what is the formula of the first compound, if the formula of the second compound is xj?

Jerrold has to buy 12 copies of a textbook which costs $36.25 per copy. how much must he spend for them?

Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal