Solve the problem.A sample of 250 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 10 years? Round to the nearest whole gram.
A. 180 grams
B. 9 grams
C. 0 grams
D. 1 gram
Answer: A
Mathematics
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Let x represent the number. Write the English phrase as an algebraic expression.The sum of twice a number and 30
A. 2 + x + 30 B. 60 + x C. 2x + 30 D. 2(x + 30)
Mathematics
Write the expression in the form a + bi.
A. 
+ 
i
B. - 
- 
i
C. 
- 
i
D. - 
+ 
i
Mathematics
Find the sum.-17 + 20
A. -3 B. -37 C. 3 D. 37
Mathematics
Solve.The amount of time it takes a swimmer to swim a race is inversely proportional to the average speed of the swimmer. A swimmer finishes a race in 200 seconds with an average speed of 3 feet per second. Find the average speed of the swimmer if it takes 120 seconds to finish the race.
A. 5 feet per second B. 7 feet per second C. 6 feet per second D. 4 feet per second
Mathematics