To solve this problem, work backwards.
On day 30, it is 100% algae.
On day 29, it is 50% algae.
On day 28, it is 25% algae(or 75% algae free).
It was on Day 28.
~~Hypotenuisance
First, multiply 90 by 5 to get 450. Next, evaluate 450-87-77-94. That gets us a total of 192. After that, divide that by 2 to get the average total grade needed to get a 90% average.
Mandy needs to get an average of 96% on her 2 tests to get a 90% average on her 5 tests.
To evaluate this expression, let's first start with 2a-3. We know a = 3/2. Thus, 2a - 3 is 3 - 3 which is 0. We know anything times 0 is 0 so...
...the answer is 0!!
Substitute the variables.
f(-3) = -3^2 -(-9)
After that, simplify that...
f(-3) = 9+9 = 18
The answer is 18.
You're welcome, Donkey!!!
No problem, CPhill!!
First figure out the right hand side.
1/8 to the power of -1 is the same thing as 8. Now, (x-4)^3 = 8
After this, get the cube root to the other side(you know what I mean) to get x-4 = 2.
Add 4 to both sides to get x = 6.
X is 6.
To figure out y+z, we can get the value of y and z from the second fraction. That is 3+4 which is 7. We know z is 4 from the denominator of the second fraction. 7/4 is the answer.
In total, there are 2^3 outcomes, or 8 outcomes.
These are the outcomes:
HHH
HHT
HTH
THH
TTH
THT
HTT
TTT
The top four outcomes(in bold)have at least two heads and those are the four outcomes that is the answer to the problem.
To find the number of expected juniors to come in the committee, we have to figure out the total amount of members. 18+12 is 30. There are 30 members. Now 30/3, which is the amount of people in a committee(I mean the 3), is 10. 18 divided by 10 is 1.8 junior members expected.
