it is 40.5 because area equals base times height.
Answer:
D) 9 postcards with 2 shells each.
Explanation:
9 x 2 = 18
Therefore, 9 postcards with 2 shells each is the correct answer.
Please give brainliest.
Answer:

Step-by-step explanation:
The sides AB and CD are parallel to the x-axis and 5 units apart. The length of side AB is 6-(-12) = 18 units. The area is the product of these dimensions:
Area = (Base)(Height) = (18 units)(5 units) = 90 units²
Answer:
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Step-by-step explanation:
Answer:
where is it
Step-by-step explanation: