Which of the following expressions uses correct notation? When the expression does make sense, give its length. In the following a and b are 10-vectors, and c is a 20-vector. a. a+b-c3:12.
b. (a, b, c3:13)
c. 2a+c.
d. (a,1) + (c1, b).
e. ((a, b), a).
f. [a b] + 4c.

b 1: 45 am

step-by-step explanation:

its that because if it was in the pm it would be 1345

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i

i have no clue what you just said. write a question in english?

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation: