Two Petri dishes were on the desktop in Dr. McFarlan's lab.

Dish A had cells with a radius of 3.4 × 10^-13 cm. Dish B had cells that had a radius of 4.6 × 10^-11 cm. What is the sum of the radii of the two types of cells, using scientific notation?
A.
4.634 × 10^-15 cm
B.
46.34 × 10^-14 cm
C.
463.4 × 10^-13 cm
D.
4.634 × 10^-11 cm

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0