Add or subtract. Assume all variables represent nonnegative real numbers.4
+ 4
A. 20
B. 4
C. 5
D. 20x
Answer: A
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Solve the problem.A traffic counter consists of a thin black tube stretched across a street or highway and connected to a "brain box" at the side of the road. The device registers one "count" each time a set of wheels (that is, wheels on a single axle) rolls over the tube. A normal automobile (two axles) registers two counts, and a light truck (three axles) registers three counts. Suppose that, during a one-hour period, a particular counter registers 41 counts on a residential street on which only two-axle vehicles (cars) and three-axle vehicles (light trucks) are allowed. How many cars and light trucks passed over the traffic counter? Find all the possible solutions to the problem.
What will be an ideal response?
Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 1200 years. How many years would be required for a given amount of this isotope to decay to 70% of that amount?
A. 360 yr B. 2084 yr C. 547 yr D. 617 yr
Perform the indicated operation. Write the answer in simplest form.
? 
? 4
A. 
B. 
C. 
D. 
Construct the requested tree diagram.Construct a tree diagram that shows all possible 2-letter code words using only the letters w, x, and y with no repetitions.
A. 
B. 
C. 
D. 