Just divide 300 by 15 and you get 20
20 lessons must be sold
Hope this helps!
Answer: Option A and Option B.
Step-by-step explanation:
You need to remember the logarithms properties:
You can observe in Option A:
(This is true)
You can observe in Option B:
(This is true)
You can observe in Option C:
(This is not true)
You can observe in Option D:
(This is not true)
Let's solve it!
So, let's study each factor.
x + 7 = 0 -> x = -7
x² - 49 = 0 -> x² = 49 - > x = ± √49 -> x = <span>± 7
Final answer: x = 7 and x = -7
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Answer:
80 Students were surveyed.
Step-by-step explanation:
To find the answer we need to do a Rule of Three. The Rule of Three is a Mathematical Rule that will help us to solve problems based on proportions.
1. I know that a 65% of students are 52 students. I need to know how many students represent that 100%.
2. So if 52 students mean _____ 65%
X students mean _____ 100%
Pay attention here. We have to put the same elements in the same columns. Students with studients and percentage with percentage.
3. Now I have to cross these details. I have to multiple 52*100. So:
52*100= 5200
4. Then divide that result by 65.
5200/65= 80
5. So 80 is the total number of students surveyed.