The correct answers are B, D and E
Explanation:
The best way to find if each of the statmenet is true or false is to find the percentage in each case. To do this, follow this general formula: Total number / 100 (100 representes the total) x specific percentage. Now, let's apply this formula in each statement
A)
30 ÷ 100 = 0.3 x 15 = 4.5 (This statement is false)
B)
80 ÷ 100 = 0.8 x 25 = 20 (This statement is true)
C)
50 ÷ 100 = 0.5 x 30 = 15 (This statment is false)
D)
60 ÷ 100 = 0.6 x 30 = 18 (This statement is true)
E)
20 ÷ 100 = 0.2 x 40 = 8 (This statement is true)
Okay. fist off don't think of them as 5 units each, but 1. so if you were to put it on graphing paper and box squares each time. you would be able to get 8 in for both sides to make a square. Area then would be 1600ft squared because 8 ×5 is 40 and 40×40 is 1600. then you calculate how many squares you used. 8×8=64. and 80-64=16 so 16 pieces are left over. then 9×9 (increasing the square) is 81. so 17 pieces to increase it.
You just change the denominator in too the same denominator
The first one is n^2 +34
The second one is 5 x 2n. Hope this helps