Answer:
69.9 mg
Step-by-step explanation:
A = A₀ (½)^(t / T)
where A is the final amount,
A₀ is the initial amount,
t is time,
and T is the half life.
A = 400 (½)^(4000 / 1590)
A = 69.9 mg
Answer:
The answer is D (60,40) and (80,120)
Step-by-step explanation:
hope it helps :3
Answer:
Step-by-step explanation:
The attachment completes the question;
From the question, we have the following given parameters
Required
Solve for x
Since then
--- Property: Base angle of an isosceles triangle
Also, ABC is a straight line;
So:
--- angle on a straight line
Substitute 15 for
Make the subject
Considering triangle DBA
---- angles in a triangle
Substitute 165 for and 5 for
Make x the subject
Uh
Are you talking about long multiplication? If so, I found this picture online that might help...
9514 1404 393
Answer:
12 quarters
20 dimes
Step-by-step explanation:
If all were dimes the value would be $3.20. It is $1.80 more than that. Each replacement of a dime with a quarter adds $0.15 to the value, so there must be $1.80/$0.15 = 12 such replacements.
There are 12 quarters and 20 dimes.
_____
Let q represent the number of quarters.
0.25q +0.10(32 -q) = 5.00 . . . . . total value
0.15q +3.20 = 5.00 . . . . . . . . . simplify
q = (5.00 -3.20)/0.15 . . . . . . subtract 3.20 and divide by 0.15
q = 12