Aresearcher performs an experiment to test a hypothesis that involves the nutrients niacin and retinol. she feeds one group of laboratory rats a daily diet of precisely 52.4 units of niacin and 35,995 units of retinol. she uses two types of commercial pellet foods. food a contains 0.22 unit of niacin and 170 units of retinol per gram. food b contains 0.40 unit of niacin and 95 units of retinol per gram. how many grams of each food does she feed this group of rats each day?

200.0 g of A, and 21.00 g of B.

Explanation:

Let's call the grams of food A as x and the grams of food B as y, so the units of niacin and retinol in food A are the units per gram multiplied by the mass:

Niacin: 0.22x, Retinol: 170x

And in food B:

Niacin: 0.40y, Retinol: 95y

The total unitis of niacin is 52.4 and of retinol is 35995, thus:

0.22x + 0.40y = 52.4

170x + 95y = 35995

Let's multiply the first equation by -772.7, and sum with the second one:

-170x - 309y = -40490

170x + 95y = 35995

-214y = -4495

y = 21.00 g of B

Thus,

0.22x + 0.40*21.00 = 52.4

0.22x = 44

x = 200.0 g of A

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.