During a routine check of the fluoride content of gotham city's water supply, the given results were obtained from replicate analyses of a single sample: 0.91500 mg/l , 0.88900 mg/l , 0.91100 mg/l , 0.88900 mg/l , and 0.91900 mg/l . determine the mean and 90% confidence interval for the average fluoride concentration in this sample. report the mean and the confidence interval with three significant figures. mean: 0.905 mg/l 90% confidence interval: ± 0.0124 mg/l

b

step-by-step explanation:

given

- 2 (3x + 12y - 5 - 17x - 16y + 4 )

simplify the parenthesis by collecting like terms

= - 2 (- 14x - 4y - 1) ← distribute the parenthesis by - 2

= 28x + 8y + 2 → b

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation:

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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step-by-step explanation: