Here are the answers to the questions provided along with the reasoning behind them:
Question 1: A) Alexei needs to determine how many cans are already on the shelf. The shelf can hold 58 cans and can still take 39 more cans, implying that the current number of cans on the shelf \( c \) can be modeled by the equation:
\[ c + 39 = 58 \]
To solve for \( c \): \[ c = 58 - 39 \] \[ c = 19 \]
Correct response: c + 39 = 58 and 19
Question 2: A) Trey has run already 1.2 miles and needs to find out how many more miles he must run. Assuming the race is 5.2 miles long, we can set up the equation:
Total miles required - miles already run = additional miles to run So, \( 5.2 - 1.2 = 4 \)
Since that option isn't given, if assuming the total race distance is not provided, we can't precisely determine a clear answer without it.
Assuming the race is 5.2 miles: Correct response: 4 miles
However, provided responses do not include 4. If considering a race of another length, it might lead to the conclusion that 3.6 miles could be a likely option depending on the total length if this was an option within reasonable distancing.
Question 3: A) To find the score for the last game that gives Carlos an average of 25 points over 7 games, we set up the equation for the average:
Total points scored so far + last game score = 25 * 7 (total games)
Sum of the scores: \( 27 + 18 + 24 + 32 + 15 + 27 + s = 25 * 7 \)
This simplifies to:
Correct response: 27 + 18 + 24 + 32 + 15 + 27 + s / 7 = 25
Question 4: A) The adventure club's situation can be modeled by the following inequality:
Revenue (2b) - Cost ($400) must meet or exceed $1000: \[ 2b - 400 \geq 1000 \]
To find if selling 725 bars (where \( b = 725 \)) is viable: \[ 2(725) - 400 = 1450 - 400 = 1050 \]
Since $1050 is greater than $1000, this option is indeed viable.
Correct response: 2b - 400 ≥ 1000, and yes, it is a viable option.
Question 5: A) To calculate the number of horses trained, given she uses 5 treats per horse session:
Let \( h \) be the number of horses. The equation will be: \[ 5h = 42 \]
To find \( h \): \[ h = 42 / 5 \] \[ h = 8.4 \]
Since you cannot train a fraction of a horse, this option is not viable in practical terms.
Correct response: 5h = 42, so h = 8.4 horses, which is not viable.
The answers depend on the context established by the question and the mathematical relationships devised.