technetium-99m is used as radioactive tracer for certain medical tests. It has a half-life of 1 day. Consider the function T where T(d) = 100(2)^-d is the percent of technetium-99m remaining d days after the test. Which expression represents the number of days until only 5% remains? A) log20 2. B) -log2 20. C) log2 (1/20). D) -log2 (1/20).​

Which of the following is true for the relation f(x)=2x^2+1

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

Barbara has a good credit history and is able to purchase a car with a low-interest car loan. she co-signs a car loan for her friend jen, who has poor credit history. then, jen defaults on the loan. who will be held legally responsible by the finance company and why? select the best answer from the choices provided. a. barbara will be held legally responsible because she has a good credit history. b. jen will be held legally responsible because she drives the car. c. barbara will be held legally responsible because she is the co-signer. d. jen will be held legally responsible because she has a poor credit history. the answer is a