Caleb earns $10 per hour. He worked 4 hours on Monday, Wednesday, and Friday. He worked 8 hours on Tuesday and Thursday. Which expression can be simplified to determine that total amount Caleb earned. a. (3x4+2x8)x10 c. (3x4)+2x8x10
b. 3x4+2x8x10 d. 3x4+(2x8x10)

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?