Can anyone please help me really struggling

C 862 square units

Step-by-step explanation:

the length of side of Octogan is given by the square. so length of each side is 15

Area of an Octogan

A=2(1+2)a^2

A=2(1+2)15^2 = 1086.4 square units

A= l X w

A= 15 X 15 = 225 square units

1086.4 - 225 = 861.4 square units

logv3(x+2)=1

rewrite in exponential form:

logb(x) = y is equal to b^y =x

b = 3, y = 1

now solve for x:

3^1 = x+2)

x = 3-2

x = 1

see the picture for the graph.