You have diving lessons every fifth day and swimming lessons every third day. today you have both lessons. in how many days will you have both lessons on the same day again?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Factor -8x3-2x2-12x-3 by grouping what is the resulting expression?

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%