Answer:
2998 ; 17%
Step-by-step explanation:
Given the function:
t(c)=-3970.9(ln c)
c = % of carbon remaining ; t = time
1.) c = 47% = 47/100 = 0.47
t(0.47) = - 3970.9(In 0.47)
t = - 3970.9 * −0.755022
t = 2998.119
t = 2998
B.)
t = 7000
t(c)=-3970.9(ln c)
7000 = - 3970.9(In c)
7000 / - 3970.9 = In c
−1.762824 = In c
c = exp(−1.762824)
c = 0.1715596
c = 0.1715596 * 100%
c = 17.156% ; c = 17%
The correct expression would be n+40
It would be $20.40 because 20% off of $28.00 is $22.4 - $2.00= $20.40
<span>8.4. To come to this conclusion, one must remember that 1/10 of a number is in essence saying this is 1 out of 10 equally divided portions of a number. This is equivalent to 10%. Multiply the number by the denominator, in this case 10, and you will get the total number.
0.84 x 10 = 8.4 (10% x 10 = 100%). Another way to look at it is to add 0.84 ten times. Either way you should end up with 8.4.</span>
Answer:
Step-by-step explanation: