exam Maths Puzzle Numerical Ability

my daughter is doing math quiz and doesnt under stand how to find the answer to this problem... find the sum of the first 100 odd numbers?

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exam Other Question

what is the surface area of a cilynder with a diameter 12 inches and height of 8 inches? use 3.14 for pie key works for radio wealth, last week the worked as fallows
monday 4 5/8 hrs
tuesday 7 1/6 hrs
wensday 9 3/4 hrs
thursday 8 1/2 hrs
friday 9 1/2 hrs
for how many hours did key worked last week?
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