Abook is to have 250 pages that will be numbered with arabic numerals beginning with 1. how many times will the digit 2 be used in numbering the pages?

Total-20

101–200 : 10+ 1+9+1 (102,112,122,132, ——————————….192–10)

Total- 21

201- 250~ 50+5+9+1( 201250—- 50 )

Total - 65

Total - 20+21+65 = 106

25.3

step-by-step explanation:

1st step

add 3+6

=9

multipy 9*3

=37

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²