Answer:
A certain element has 25 protons.
Step-by-step explanation:
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The answer is C. 100 because the total measure of a quadrilateral is 360. When you add up the 3 interior angle measures, it adds up to 260. Then you subtract 360-260 to get 100 as the fourth angle measure. Hope that this helped!
Answer:
48 inches
Step-by-step explanation:
There are 12 inches in 1 foot. So multiply by 12 to convert from feet to inches.
4 × 12 = 48
4 feet = 48 inches
Answer:
816 square feet
Step-by-step explanation:
13(16+20+12) + 16(12) = 816