Average speed in miles per hour is the number of miles traveled divided by the number of hours:

Solving for time:

time = \( \frac{\text{distance}}{\text{speed}} \)
time = \( \frac{225mi}{25mph} \)
9 hours

The equation for this sequence is:

a_n = a_n-1 + 7

where n is the term's order in the sequence, a_n is the value of the term, and a_n-1 is the value of the term before a_n. This makes the next number:

a₆ = a₅ + 7
a₆ = 29 + 7
a₆ = 36

To multiply terms with radicals, multiply the coefficients and radicands separately:

3\( \sqrt{9} \) x 4\( \sqrt{8} \)
(3 x 4)\( \sqrt{9 \times 8} \)
12\( \sqrt{72} \)

Now we need to simplify the radical:

12\( \sqrt{72} \)
12\( \sqrt{2 \times 36} \)
12\( \sqrt{2 \times 6^2} \)
(12)(6)\( \sqrt{2} \)
72\( \sqrt{2} \)

A number in scientific notation has the format 0.000 x 10^exponent. To convert to scientific notation, move the decimal point to the right or the left until the number is a decimal between 1 and 10. The exponent of the 10 is the number of places you moved the decimal point and is positive if you moved the decimal point to the left and negative if you moved it to the right:

0.0000227 in scientific notation is 2.27 x 10^-5

The greatest common factor (GCF) is the greatest factor that divides two integers.