(3x2 - 2x + 5) - (3x2 - 8x + 2) =

Your answer is 6x + 3.

To get this answer you calculate the product and get (6x-2x+5)-(6x-8x+2). Then you want to collect like terms and get (4x+5)-(-2x+2). Then remove unnecessary parentheses. Then collect like terms and subtract. 6x+5-2 to 6x+3.

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the probability of a bulb lasting for at most 552 hours is 0.953.

Step-by-step explanation:

Since the life of light bulbs are distributed normally, we would apply the formula for normal distribution which is expressed as

z = (x - µ)/σ

Where

x = the life of light bulbs in hours.

µ = mean hour

σ = standard deviation

From the information given,

µ = 510 hours

σ = 25 hours

We want to find the probability of a bulb lasting for at most 552 hours. It is expressed as

P(x ≤ 552)

For x = 552

z = (552 - 510)/25 = 1.68

Looking at the normal distribution table, the probability corresponding to the z score is 0.953