Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):

2 + (2 + 3) ÷ 2 x 4 - 3²
P: 2 + (5) ÷ 2 x 4 - 3²
E: 2 + 5 ÷ 2 x 4 - 9
MD: 2 + \( \frac{5}{2} \) x 4 - 9
MD: 2 + \( \frac{20}{2} \) - 9
AS: \( \frac{4}{2} \) + \( \frac{20}{2} \) - 9
AS: \( \frac{24}{2} \) - 9
AS: \( \frac{24 - 18}{2} \)
\( \frac{6}{2} \)
3

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:

0.0008153 in scientific notation is 8.153 x 10^-4

To add these distances, they must share the same unit so first you need to first convert the swim distance from meters (m) to kilometers (km) before adding it to the bike and run distances which are already in km. To convert 100 meters to kilometers, divide the distance by 1000 to get 0.1km then add the remaining distances:

total distance = swim + bike + run
total distance = 0.1km + 30.2km + 7.6000000000000005km
total distance = 37.9km

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 = \( \frac{50mi}{25mph} \)
2 hours

The first few multiples of 5 are [5, 10, 15, 20, 25, 30, 35, 40, 45, 50] and the first few multiples of 7 are [7, 14, 21, 28, 35, 42, 49, 56, 63, 70]. The first few multiples they share are [35, 70] making 35 the smallest multiple 5 and 7 have in common.