Solve for x: one over five (5x + 12) = 18 (5 points) a
seventy-eight over five

b
one hundred-two over five

c
6

d
30

4. a spring scale is constructed so that each 0.10-n increment is separated by 0.50 cm. what spring constant is necessary for the scale to be accurate? -1.0n/cm -0.10n/cm -9.8 n/cm -0.20n/cm

What is the number 321,000,000 in scientific notation? also what is the number? ?

Hi, can anyone show me how to do this problem? 100 points for this. in advance