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3 years ago

Valerie earns $24 per hour. Which expression can be used to show how much money she earns in 7 hours?

Mathematics

2 answers:

GuDViN [60]3 years ago

8 0

B. because you are still multipying they just broke it down (7*24)= 168 , and b also = 168

hammer [34]3 years ago

6 0

B cause it is adding and multiplying

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3 years ago

A researcher interested in the effects of humor on memory randomly assigns 16 participants to either the humor group or the no-h

masha68 [24]

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3 years ago

X - 5(x + 1) = 3x + 2<br> answer , but show work pls.

Nitella [24]

Answer: x = -1

Step-by-step explanation:

Starting:

x-5(x+1)=3x+2

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-4x-5=3x+2

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3 years ago

40% of Oatypop cereal boxes contain a prize. Hannah plans to keep buying cereal until she gets a prize. What is the probability

aleksley [76]

Answer:

$(0.6)^{n}+n(0.4)(0.6)^{n-1}+\frac{n(n-1)(0.4)^{2}0.6^{n-2}}{2} +\frac{n(n-1)(n-2)0.4^{3}0.6^{n-3}}{6}$

Step-by-step explanation:

We will use the binomial distribution. Let X be the random variable representing the no. of boxes Hannah buys before betting a prize.

Our success is winning the prize, p =40/100 = 0.4

Then failure q = 1-0.4 = 0.6

Hannah keeps buying cereal boxes until she gets a prize. Then n be no. times she buys the boxes.

P(X ≤ 3) = P(X=0) +P(X=1)+P(X=2)+P(X=3)

= $\binom{n}{0}p^{0}q^{n-0}$ + $\binom{n}{1}p^{1}q^{n-1}$ + $\binom{n}{2}p^{2}q^{n-2}$ + $\binom{n}{3}p^{3}q^{n-3}$

= $q^{n}+npq^{n-1}$ + $\frac{n(n-1)(p)^{2}q^{n-2}}{2}$ + $\frac{n(n-1)(n-2)p^{3}q^{n-3}}{6}$

= $(0.6)^{n}+n(0.4)(0.6)^{n-1}+[tex]\frac{n(n-1)(0.4)^{2}0.6^{n-2}}{2} +\frac{n(n-1)(n-2)0.4^{3}0.6^{n-3}}{6}$

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3 years ago

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Andrea wants to rent a bike for six days.

ella [17]

Too lazy to format so here

R = 20D =

R = 20(6) =

120 = 20(6)

r = 120 = the days it cost to rent bike

so expensive

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3 years ago

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