Which of the following is a variable quantity?
1 point
a. the number of years in a decade
b. the number of hours in a day
c. the number of sides of a triangle
d. the number of COVID-19 deaths every day.
Give the numerical coefficient of a variable that has no number written beside it.
1 point
a. 0
b. 1
c. none
d. -1
What are the constants in the algebraic expression 3x -12y – 6z.
1 point
a. 3, 12 and 6
b. 3, -12 and 6
c. 3, 12 and -6
d. 3, -12 and -6