Answer:

Step-by-step explanation:
Split the diametre in half before proceeding:

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Answer:
11 1/4 inches.
Step-by-step explanation:
2 1/4 times 5 = 11 1/4
42/98=3/7
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Answer:
35cm
120cm^2
Step-by-step explanation:
J=-8c²-4cd-d²
k=-3c²+7cd-3d²
j+k=
-8c²-4cd-d²-3c²+7cd-3d²
-11c²-4d²+3cd