Write the number in standard form.A group of astronomers detected a radio signal that originated approximately 
light years from Earth.
A. 793,800
B. 7,938,000
C. 396.9
D. 79,380
Answer: A
Mathematics
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Solve the problem.Last week, Samantha ran 21 miles. This week, she ran 19
miles. How much more did she run last week?
A. 1
miles
B. 1
miles
C. 40
miles
D. 25 miles
Mathematics
Solve the problem.The half-life of Titanium 45 is 3.1 hours. If the formula 
gives the percent (as a decimal) remaining after time t (in hours), sketch P versus t.
A. 
B. 
C. 
D. 
Mathematics
Identify the domain of f. Write your answer in set-builder notation.f(x) = 
A. {x|x ? -8, x ? 0, x ? 8} B. {x|x ? 0, x ? 64} C. {x|x ? -8, x ? 8, x ? -2} D. {x|x ? -8, x ? 8}
Mathematics
Write the ratio as a fraction.the ratio of 77 to 126
A. 
B. 7
C. 
D. 
Mathematics