What is the value of r?
1.9r+0.1r=0.6
enter your answer in the box.
r=

Given in the question

1.9r+0.1r=0.6

Find out the value of r .

To prove

As the equation given in the question be

1.9r+0.1r=0.6

Sinplify the equation

19r + 1r = 6

now solving the above equation

we get

20r = 6

now simplify the above terms

r = 0.3

Therefore the value of r is 0.3 .

Hence proved

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.