Which of the following is true of enzymes?

a. An enzyme is consumed during a chemical reaction.
b. An enzyme is converted to a product during a chemical reaction.
c. An enzyme lowers the energy of activation required for a given reaction.
d. An enzyme catalyzes a number of different chemical reactions.

Option C.

Enzymes lowers activation energy required for a given reaction.

Explanation:

Enzymes are biological catalysts that are produced by living organisms which speed up the rate of chemical reaction.

Enzymes lower the activation energy of a given reactions. As the activation energy is lowered, the reaction becomes faster. Enzymes speed up the rate of reaction by lowering the activation energy.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

the question isn't complete here so i can't right an answer '_'