Joe earned $10 in allowance this week and $2 for each extra chore he did. Let (c) represent the number of extra chores Joe did this week. Which of the following expressions best represents Joe's income for the week? a. 10 + 2c b. 10 + 2 c. 10 + c + 2 d. 10c + 2

What is the number 321,000,000 in scientific notation? also what is the number? ?

Ageologist had two rocks on a scale that weighed 4.6 kilograms together.rock a was 0.5 of the total weight.how much did rock a weigh?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0