If 2 grams of element x combine with 4 grams of element y to form compound xy, how many grams of element y would combine with 12 grams of x to form the same compound?

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

In france, grapes are 1.95 euros per kilogram. what is the cost of grapes, in dollars per pound, if the exchange rate is 1.14 dollars/euro? (2.6)