Why do computer map makers digitize map data

Computer map makers digitize map data by "D. Comparing satellite images". Computer map makers uses computer data from satellite images and proper global positioning to create a perfect map that has the exact details of a specific place or the whole world.

Explanation:

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.