In how many map squares did we
spot less than 20 plant species?

3

Step-by-step explanation:

You should get three because you don't look at 20 and above look at 19 and below and count how many there are and look at the number chart to see what the two bars are worth:

0 - 9 = 1

10 - 19 = 2

1 + 2 = 3

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|