tbiles99

18.11.2020 • 

Mathematics

PLEASE HELP! WILL MARK BRAINLIEST IF RIGHT AND 100 POINTS! THREE QUESTIONS! 1. Gerry spends $1.25 each day on lunch at school. On Fridays, she buys an extra snack for $0.55. How much money will she spend in two weeks?

2. Art galleries often price paintings by the square inch. If a painting measures 22.5 inches by 34 inches and costs $4.15 per square inch, what is the selling price for the painting?

3. Eric’s goal is to walk 2.75 miles to and from the park every day for an entire year. If he meets his goal, how many miles will Eric walk?

Ответ:

manny2085

09.02.2022

Mathematics

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1.) she will spend $13.60 in two weeks

2.) $3,174.75 because 22.5 x 34 x 4.15 = 3,174.75

3.) 1003.75 miles. Explanation: if we know that there's 365 days in a year and Eric wants to walk 2.75

Step-by-step explanation:

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Ответ:

sharonkrobinson

04.09.2020

Mathematics

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This is a binomial related problem. In this case,

P(correct) = p = 1/3
P(wrong) = q = 1-p = 1-1/3 = 2/3

The general formula for binomial is;
Summation [nCk(p)^k(q)^(n-k)]

Where
n = 9
k = 7,8,9

Substituting;
P(7≤X≤9) = [9C7(1/3)^7(2/3)^2]+[9C8(1/3)^8(2/3)^1]+[9C9(1/3)^9(2/3)^0] = [16/2187]+[2/2187]+[1/19683]=163/19683 ≈ 0.00828

Therefore, the  probability of getting atleast 7 question right is 0.00828.

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