Which line must be perpendicular to ↔cf? ad ← → gi ← → be ← → hj ← →

 Line must be perpendicular to Line CF is Line GI .

Step-by-step explanation:

From the given picture, we are given three lines (AD , BE and CF) intersecting other two lines (QI and HJ).

We can see that Line AD and Line CF is making right angle with line GI>

Also, we know that the perpendicular lines intersect at right angles to each other.

Hence, the Line must be perpendicular to Line CF is Line GI.

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.

13cm

step-by-step explanation:

(apex)