16. x + 8 17. 24 ÷ x
18. 3(x+4)
19. 5x
20) 30 – 5x
21) 2x + 5
22). x + 1
23) 25x
24) 60x
25) 25x + 10

Step-by-step explanation:

Taking value of x= 4

16. 4 + 8 = 12

17. 24 ÷ 4 = 6

18. 3(4+4) = 3 × 8 = 24

19. 5 × 4 = 20

20. 30 - (5 × 4) = 30 - 20 = 10

21.( 2 × 4 )+ 5 = 8 + 5 = 13

22. 4 + 1 = 5

23. 25 × 4 = 100

24. 60 × 4 = 240

25. (25×4) + 10 = 100 + 10 = 110

1/2 = 0.5

Work Shown:

3/4 = 0.75

Gaining 3/4 of its size means that it is 1.75 times larger. For example, if the population starts at 100 members, then gaining 3/4 = 75% of the population means it bumps up to 175.

If we start at 300 members, then it jumps to 300*1.75. I won't multiply that out as you'll see why later below.

N(t) = 300*(49/16)^t

300*1.75 = 300*(49/16)^t ... replace N(t) with 300*1.75

1.75 = (49/16)^t the 300s cancel after dividing both sides by 300

(49/16)^t = 1.75

Log[ (49/16)^t ] = Log[ 1.75 ]

t*Log(49/16) = Log(1.75)

t = Log(1.75)/Log(49/16)

t = 0.5

It takes half a week for the population to gain 3/4 of its size. This is true no matter what the starting point is.