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

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.

answer: i think one of the answer is $150 and $300?

step-by-step explanation: