Answer:
75 days
Step-by-step explanation:
The multiplier each day is ...
(1/2)^(t/15)
Then we want to find t such that ...
5 = 160·(1/2)^(t/15) . . . . . . 5 mg are left after t days
5/160 = (1/2)^(t/15) . . . . . . divide by 160
1/32 = (1/2)^5 = (1/2)^(t/15) . . . . rewrite the left side
Equating exponents (equivalent to taking logs), we get ...
5 = t/15
5·15 = 75 = t . . . . . multiply by 15 to find t
After 75 days, there will be 5 mg left.
In order to divide fractions, you multiply the reciprocal. That means you flip the numerator and denominator. So
1 ÷ 1/5 = 1 × 5/1 = 5
Hey there! :)
Answer:
0.3.
Step-by-step explanation:
Looking at the row for "Less than 80° F", the column for "Rain" shows a 0.3 probability in the table. Therefore:
The probability of rain on a day less than 80°F is 0.3.
Answer:
Look at the explanation.
Step-by-step explanation:
Start y=-2x-3 at the Y -3 and X 0, then go up two and to the right one, like a staircase. For y=-x+3 start on Y 3 and X 0 and go down 1 x and 1 y like a downstair staircase with 1 unit down.
Answer:
n = log(
)
Step-by-step explanation:
Take the logarithm of both sides of the equation to remove the variable from the exponent.