The table shows some information about the lifetimes, t , in hours, of some lightbulbs. Lifetime Frequency 25 < t ≤ 50 47 50 < t ≤ 100 86 100 < t ≤ 150 45 150 < t ≤ 200 36 200 < t ≤ 250 0 250 < t ≤ 300 37 300 < t ≤ 350 50 Estimate the mean lifetime of a bulb. Give your answer rounded to 2 DP.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

b. f(x) = –√x + 3this is the correct answer

answer: (-8,4) are the coordinates of a

step-by-step explanation:

let the side of square abcd is x .

thus the area of square abcd is .

now, by the diagram area of triangle ead= 1/2 × ea × ad = 1/2 × ea × x

( because ad is the side of square)

and, according to the question,

the areas of square abcd and right ead are equal.

⇒

⇒ea=2x

thus, ea: ab=2: 1

therefore, point a divides line segment eb into the ratio 2: 1.

⇒ by sectional formula coordinates of a are,

=

=

=(-8, 4)

thus the coordinates of a are (-8,4)