in a box there 34 batteries. 6 of the batteries do not work. If 4 are selected without replacement find the probability that all of them work.

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Vera is on her school's track and field team. in a practice long-jump competition against her teammates, she gets 5 points for landing over the farther line. she gets a total of 7 jumps and lands x times over the farther line and the rest of the times over the closer line. which of the following functions represents vera's total score? a. f(x)=10x b. f(x)=5x+35 c. f(x)=10x+5 d. f(x)=70-5x

The authors use the word “backbone” in lines 3 and 39 to indicate that