2-31.  write an equation and solve it to find the answer to the question below.   use the 5-d process to you write the equation, if needed.  remember to define your variable and to write your answer in a complete sentence. susan is buying three different colors of tiles for her kitchen floor.  she is buying 25 more red tiles than beige tiles, and three times as many navy-blue tiles as beige tiles.  if susan buys 435 tiles altogether, how many tiles of each color does she buy?

r = 25+b

n = 3b

n+r+b=435

3b+25+b+b=435

5b+25=435

5b=210

b=42

r = 25+42 = 67

n = 3(42) = 126

the solution is h=10 because you add 9 to each side of the equation.

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.