Answer:
- 65 -3x = 55 -2.5x
- 20 periods
- $5
Step-by-step explanation:
The value of the first card starts at $65 and decreases by $3 for each of x periods. Its value is ...
65 -3x
The value of the second card starts at $55 and decreases by $2.50 for each of x periods. Its value is ...
55 -2.5x
The equation that can be used to find x that makes the values equal is ...
65 -3x = 55 -2.5x
__
The solution can be found by adding 3x-55 to both sides of this equation.
10 = 0.5x
Multiplying by 2 gives ...
20 = x
After 20 30-day periods. the cards will have the same value.
__
The value after 20 periods is ...
65 -3×20 = 65 -60 = 5
Both cards will have a value of $5 when they have the same value.
Answer: B
Step-by-step explanation:
$4.95 x 6 people = 29.7 ≈ $30
For the writing assignment, the number of ways of choosing from two essay topics three different mandatory lengths is given by:

Thus, he has 20 choices to make for the writing assignment.
For the reading assignment, the number of ways of choosing from <span>five biographies and three volumes of essays</span> is given by:
5 x 3 = 15
Therefore, the total number of choices is given by 6 + 15 = 21 choices.
<span>(100 cubed x 9) + (100 squared x 8) + 10 squared = 9,800,100 </span>
3/5 = 6/10 (multiply 2 to top and bottom to get 6/10)
There are 6 1/10ths, so the answer is 6 sections
hope this helps :D