Answer: Area: 99cm Perimeter: 40cm
Step-by-step explanation:
To find the area, you would multiply 9cm by 11cm because the formula for area is length times width. To find the perimeter, you add all the sides, which would mean you add 9 + 9 + 11 + 11, making the perimeter 40cm.
Answer:
d = 9
200% = double
aka 2d = 18
7m
P=a+b+c+d
31=6+8+10+d
31=24+d
31-24=d
7=d
divison
3x=81
3x/3=81/3
I think there are 13 atoms present.
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