The answer is a, but explain how you got the answer.

You can see that the function crosses the x axis at x= -2 and x=5.

With this knowledge, we can justify the answer in more than one ways. For example, a polynomial with such roots is

Alternatively, we know that in a quadratic equation in the form

s is the sum of the roots and p is their product. In our case, the sum is 3 and the product is -10, so again we come to the conclusion that the equation is

answer: was that a question or answer?

step-by-step explanation:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)