Rebecca+runs+a+quarter-mile+each+we ek. +in+each+of+the+last+6+weeks+her+ti me+hasimproved+(decreased)+by+2%,+a nd+she+can+now+run+a+quarter-mile+i n+66+seconds. What+was+her+time+six+weeks+ago?.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

i think the answer is a and b

i wish you luck