Answer:
Step-by-step explanation:
A. Cruz rounded the price up to $15
so 15x3=$45
his estimate will be higher as he rounded up
B. Jessica rounded down to $14
so 14x3=$42
her estimate will be lower as she rounded down
Number 10 is d and i’ll try 9 give me a minute lol
Answer: 
Step-by-step explanation:
Given
The dimension of the rectangular box is 
If the Straw fits exactly into the box diagonally
So, the length of the longest diagonal of the rectangular box is equal to the length of the straw i.e.

Do you have options for us?
Answer:
15
Step-by-step explanation:
Using the formular, Sn = n/2(2a + (n - 1)d)
where, n = 6: Sn = 6/2( -20 + 5(3)) = 3(15 - 20)
∴ Sn = 15