When a photograph is taken, the exposure time, t is directly proportional to the square of the size, f , of the opening in the camera lens. t = 0.02 when f = 8. it can be shown that t = 1/3200 f squared. calculate the value of f when t = 0.0098

f = 5.6

Step-by-step explanation:

given the quantities are proportional then the equation relating them is

t = kf² ← k is the constant of proportionality

To find k use the condition t = 0.02 when f = 8

k = = =

t = ← equation of proportionality

when t = 0.0098, then

0.0098 = ( multiply both sides by 3200 )

f² = 0.0098 × 3200 ( take the square root of both sides )

f = = 5.6

first anwser choice.

step-by-step explanation:

the greater/less or equal to symbol (> or < with the line at the bottom) is a closed/filled in circle.

-5c + 2 _< _27

subtract from both sides by 2

-5c _< _ 27

divide both sides by -5

c _< _ 5.4

flip the inequality sign

c _> _5.4

the only possible answer that would match the simplified inequality is the first answer choice

step-by-step explanation:

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