Aruler has markings as shown below. stefan uses this ruler to measure the length of a metal rod. how many decimal places should his answer include?

Based on a ruler in centimeters, with ten divisions between each centimer mark, you will have marks at every 0.1 cm.

Then, the measure of the length of a metal rod should have 1 decimal place.

That decimal place means mlimiters, given that 1 mm = 0.1 cm.

1 decimal place

log7 + log7 − log7 = + log7

This is correct answer

Step-by-step explanation:

Explanation:-

we will use properties of logarithm

first property

i) log (ab) = log a + log b

second property  

ii)

Third property

iii)

Now given log7 +log7 - log7

                                           = log(7X7) - log7 ( used first property)

                                           = log(49)- log(7)

                                           =        (used second property)

                                          = + log(7)