3)

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6)

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7)

Answer:
481
Step-by-step explanation:
There are several ways you can get there.
1. There are only 13 numbers, so you can write them down and add them up.
25 + 27 + 29 + ... + 47 + 49 = 481
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2. You can use the formula for the sum of an arithmetic sequence. This one has a starting value of 25, an ending value of 49, and 13 terms.
Sum = ((start) + (end))/2 × (number of terms) = (25 +49)/2×13 = 481
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3. You can use a formula for the terms of the series and evaluate the sum.
an = 25 +2(n -1) = 2n +23

In total you finished 1212+44 problems , which is 1256 problems
2424 -1256=1168 problems left
1168/2424=48%
48% of problems remain
He would have paid $15.94 and since he’s paying with a $20 bill, all you would do is subtract $15.94 from $29. This leaves us $4.06.
I believe B is the answer