Aline has a slope of 1/4 and passes through the point (0.2, 4/5 find the value of b, the y-intercept.

b = 3/4

Step-by-step explanation:

The linear equation has the following general form.

y = a.x + b

where,

y is the dependent variable

a is the slope

x is the independent variable

b is the y-intercept

The slope is 1/4, so

y = 1/4 . x + b

We have the ordered pair (0.2, 4/5). We can find the y-intercept by replacing these values in the previous equation.

y = 1/4 . x + b

4/5 = 1/4 . 0.2 + b

b = 3/4

The final equation is

y = 1/4 . x + 3/4

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.