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soldi70 [24.7K]
3 years ago
14

Gina is comparing four long distance phone plans. The table shows the cost of each plan. If Gina plans to use less than 500 minu

tes each month, the most cost effective plan is
plan A
plan B
Plan C
Plan D

Mathematics
2 answers:
gayaneshka [121]3 years ago
8 0

I am also answering that same question on a website for algebra and have the same question and i think the answer is A.

Svet_ta [14]3 years ago
6 0

Answer:

Plan A

Step-by-step explanation:

Gina plans to use less than 500 minutes each month.

The cost four plans are given in the table.

Let's find the cost of each plan assuming that Gina use 500 minutes.

Plan cost = Monthly fee + const per minute

Plan A cost = $15 + 500*0.05 = $15 + $25 = $40

Plan B cost = $5 + 500*0.15 = $5 + $75 = $80

Plan C cost = $10 + 500*0.10 = $10 + $50 = $60

Plan D cost = $20 + 500*0.20 = $20 + $100 = $120

By comparing the price, the Plan A is cost effective plan.

therefore, the answer is  Plan A.

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Answer:

1/6 ,1/6, 1/24, no events A and B are not independent events.

Step-by-step explanation:

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3 years ago
A ramp is used to load suitcases on an airplane. If the cargo door is 7 feet from the ground and the angle formed by the end of
melisa1 [442]

Answer: 16.56\ ft

Step-by-step explanation:

You must draw a right triangle as the one attached, where "x" is the lenght  in feet of the ramp.

You need to use the following Trigonometric Identity:

sin\alpha=\frac{opposite}{hypotenuse}

In this case you can identify that:

\alpha =25\°\\\\opposite=7\\\\hypotenuse=x

Now you must substitute these values into sin\alpha=\frac{opposite}{hypotenuse}:

sin(25\°)=\frac{7}{x}

Finally, you must solve for "x" in order to find its value.

This is:

sin(25\°)=\frac{7}{x}\\\\xsin(25\°)=7\\\\x=\frac{7}{sin(25\°)}\\\\x=16.56

6 0
3 years ago
Solve by any method (graphing, substitution, linear combination) <br> y=x−7 <br> 5x+2y=7
Virty [35]

Answer:

  (x, y) = (3, -4)

Step-by-step explanation:

See the attached for a graph.

3 0
3 years ago
10.5% of the population is 65 or older. Find the probability that the following number of persons selected at random from 25 peo
julia-pushkina [17]

Given:

The sample size n=25

Probability of population is 65 or older is 10.5%.

This date follows the binomial distribution,

\begin{gathered} n=25,p=0.105 \\ X\rightarrow B(n=25,p=0.105) \end{gathered}

To find the probability that at most 2 are 65 or older,

\begin{gathered} P(X=x)=^nC_x(p)^x(1-p)^{n-x} \\ P(0\leq X\leq2)=P(X=0)+P(X=1)+P(X=2) \\ =^{25}C_0(0.105)^0(1-0.105)^{25-0}+^{25}C_1(0.105)^1(1-0.105)^{25-1}+^{25}C_2(0.105)^2(1-0.105)^{25-2} \\ =0.0625+0.1832+0.2579 \\ =0.5036 \\ \approx0.504 \end{gathered}

Answer: Probability is 0.504 .

8 0
1 year ago
Y=6x-11 -2x-3y=-7 solve each system of equation by substitution
Anit [1.1K]

Answer:

(2, 1 )

Step-by-step explanation:

Given the 2 equations

y = 6x - 11 → (1)

- 2x - 3y = - 7 → (2)

Substitute y = 6x - 11 into (2)

- 2x - 3(6x - 11) = - 7 ← distribute and simplify left side

- 2x - 18x + 33 = - 7

- 20x + 33 = - 7 ( subtract 33 from both sides )

- 20x = - 40 ( divide both sides by - 20 )

x = 2

Substitute x = 2 into (1) for corresponding value of y

y = 6(2) - 11 = 12 - 11 = 1

Solution is (2, 1 )

5 0
3 years ago
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