The accompanying diagram shows a semicirculular arch over a
street that has a radius of 14 feet. A banner is attached to the arch
at points A and B, such that AE = EB = 5 feet. How many feet above
the ground are these points of attachment for the banner?

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.

the answer is b.

64

step-by-step explanation:

c=2πr=2·π·8≈64

2y+y=5

add 2y and y

divide the numbers

step-by-step explanation: