Solve the problem.A certain radioactive isotope has a half-life of approximately 1800 years. How many years would be required for a given amount of this isotope to decay to 60% of that amount?
A. 1327 yr
B. 2379 yr
C. 720 yr
D. 1267 yr
Answer: A
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Solve the application by adding or subtracting appropriately. Answer with a complete sentence.Carlos's grocery bill was $9.71. He gave the clerk a $20 bill. How much change should he receive?
A. He should receive $10.29 change. B. He should receive $9.29 change. C. He should receive $9.71 change. D. He should receive $10.28 change.
Complete the statement using the required property of multiplication.Identity property: 1 ? 34 = _______
A. 34 B. 1 C. 35 D. 0
Change the word statement to an equation. Use x as the variable.When 2 times a number is subtracted from 7 times the number, the result is 35.
A. 2(x - 7) = 35x B. 2x + 7x = 35 C. 7x - 2x = 35 D. 2x(7 - x) = 35
Solve the system of linear equations. x + 2y = 2-6x + 3y = -12
A. No solutions B. (3, -1) C. (3, 2) D. (2, 0)