Many of you will live to the year 2100, which is not a leap year. Not all years which are divisible by 4 are leap years. A centennial year (multiple of 100) is a leap year only if it is not divisible by 400. So 2000 is (was) a leap year, 2400 is a leap year, but 2100 and 2200 are not leap years. Non-centennial years which are multiples of 4 are always leap years. If P is the statement and Q is the statement and R is the statement
P: ”L mod 4 = 0”
Q: ”L mod 100 = 0” R: ”L mod 400 = 0”

For example, the years 1600, 2000, and 2400 are century leap years since those numbers are divisible by 400, while 1700, 1800, 1900, 2100, 2200, and 2300 are common years despite being divisible by 4.

Step-by-step explanation:

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x