Anybody know how to solve this ?

6

Step-by-step explanation:

Just try and substitute every choice and when the answer is 121 then it's the correct answer

For example

4 (4)^2 - 4 ( 4 ) + 1 = 49 which is not the correct answer

4 (5 )^2 - 4 ( 5 ) + 1 = 81  not the correct answer

4 (6)^2 - 4 ( 6 ) + 1 = 121  which is the answer they gave you for the area and that's the correct answer

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm