Answer:
Part A is 34
Part B is 2
Step-by-step explanation:
This question did provide some clues to answer this question. Every week, the area covered by the algae is multiplied by 2^1.
To find the area cover increase by the algae per day, the exponent should be divided by 7 since there are 7 days in a week. Hence, every day, the area covered by the algae multiplies by 2^(1/7). In other words, 1 day after the algae was spotted, the area is 12.5 * 2^(1/7), which answers part B.
10 days after the algae was spotted, the area covered by the algae is 12.5 * 2^[(1/7)*10] = 33.6475... , which rounds up to 34 and answers part A.
First of all, we can work out the length of BD: using the pythagorean theorem, we have

Now, we can work on triangle BCD and use the sine theorem: we have

Plugging the values and solving for
we have

We deduce

So, to solve this problem you just have to add up all of the smaller parts.
First, we have our daily charge: $46.99
2 * 46.99 = $93.98
Next, we have our mileage costs, which will be
[ (miles driven) * (charge per mile) ] - (50 * 0.35)
(430 * 0.35) - 17.5
150.50 - 17.50 = $133
Finally, we add our daily rate to our mileage costs.
93.98 + 133 = $226.98
Mili means 1000
1gram=1000ml
72 grams=72 times 1000ml
72 grams=72000 ml