Add. Do not use a number line except as a check.-9.3 + 5.1
A. -14.4
B. 14.4
C. -4.2
D. 4.2
Answer: C
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Use an Euler diagram to determine whether the argument is valid or invalid.All painters use paint.All painters use brushes.Some people who use paint are teachers.Therefore, Some painters are teachers.
A. valid B. invalid
Solve the problem.In the formula A(t) = A0ekt, A is the amount of radioactive material remaining from an initial amount A0 at a given time t, and k is a negative constant determined by the nature of the material. An artifact is discovered at a certain site. If it has 59% of the carbon-14 it originally contained, what is the approximate age of the artifact? Carbon-14 decays at the rate of 0.0125% annually. Round to the nearest year, if necessary.
A. 4720 years B. 1833 years C. 3280 years D. 4221 years
Make the indicated conversion within units of time.Convert 480 minutes to hours.
A. 4 hours B. 8 hours C. 192 hours D. 20 hours
Solve the problem.The population of a small town can be modeled by P = -32t + 13,500, where t is the number of years since 2010. Interpret the P-intercept of the graph of this function.
A. The population of the town was 13,500 in 2010. B. The population of the town is decreasing by 32 people per year. C. The population of the town was 32,000 in 2010. D. The population of the town is increasing by 32 people per year.