Anew battery's voltage may be acceptable (a) or unacceptable (u). a certain flashlight requires two batteries, so batteries will be independently selected and tested until two acceptable ones have been found. suppose that 80% of all batteries have acceptable voltages, and let y denote the number of batteries that must be tested.

thats one

step-by-step explanation:

question 1: step-by-step explanation:

1/4 of 84 = 84÷4= 21

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²