Find the sum of the following measurements: reported correctly. 5.1 x 105 m + 5.22 x 105 m

Convert 0.000123 into scientific notation with the same number of sig figs. (Your answer should be in the format M x 10N U) (M is everything on the left. N is your exponent including a negative sign (if applicable) in front with no space between negative sign and exponent's number) (Examples: 2.5678 x 10-2 m, 2.5 x 105 m2) (you would type m2 for m2)

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.