16. closed
8. Which of the given sets of whole numbers
under addition? If the set is not closed, give an
example of two elements from the set whose sum is not
in the set.
(a) {10, 15, 20, 25, 30, 35, 40, ...}
(b) {1,2,3, . . . , 1000}
(c) {0}
(d) {1,5,6, 11, 17,28, ...}
(e) {n EN n 2 19)
(f) {0,3, 6, 9, 12, 15, 18, ...}

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation:

a. (14,375+570)(5.3) b. 158,417$

step-by-step explanation:

a. you are basically just setting up the equation. f= amount of debt hence 14,375. g= how much she is borrowing from her parents weekly hence 570 and t= the interest on her debt. creating the equation.

b.   14,375+570= 14,945

      14,945 x 5.3 = 79,208.5

      79,208.5 x 2(years) = 158,417(answer)

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated

sasasadaassasasasa opk ok you know