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likoan [24]
3 years ago
7

On a number line, the surface of a river is marked at −225 feet and the top of a building is marked at +18 feet, where 0 represe

nts sea level. What do −225 and +18 represent? 225 feet above sea level and 18 feet below sea level 225 feet below sea level and 18 feet above sea level 225 feet below sea level and 18 feet above 225 225 feet above sea level and 18 feet below 225
Mathematics
2 answers:
gizmo_the_mogwai [7]3 years ago
7 0

Answer:

225 feet below sea level, 18 feet above sea level.

Step-by-step explanation:

Negative represents below, if the 0 is sea level, and positive represents above.

tatuchka [14]3 years ago
4 0

Answer:

Option B.

Step-by-step explanation:

The surface of a river has been marked as (-225) feet and the top of the building at (+18) feet.

If we consider surface sea as a base line to calculate the altitudes of certain place, then altitudes above the the river surface will be positive and the altitudes below the river surface will be negative.

Therefore, (-225) feet of a river means 225 feet below the sea level.

+18 feet of a building means 18 feet above the sea level.

Option B, is the answer.

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suppose a chord of a circle is 18 in. long and is 40 in. from the center. Find the length of the radius.
drek231 [11]
Using the Pythagorean Theorem,
radius^2 = 40^2 + 9^2
radius^2 = 1,600 + 81
radius^2 = 1,681
radius = 41


6 0
3 years ago
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A standard-size bass drum has a diameter of 56 cm and is 46 deep.find the volume of this drum.
egoroff_w [7]

Answer:

35

Step-by-step explanation:

5 0
3 years ago
A quiz-show contestant is presented with two questions, question 1 and question 2, and she can choose which question to answer f
Mrrafil [7]

Answer:

The contestant should try and answer question 2 first to maximize the expected reward.

Step-by-step explanation:

Let the probability of getting question 1 right = P(A) = 0.60

Probability of not getting question 1 = P(A') = 1 - P(A) = 1 - 0.60 = 0.40

Let the probability of getting question 2 right be = P(B) = 0.80

Probability of not getting question 2 = P(B') = 1 - P(B) = 1 - 0.80 = 0.20

To obtain the better option using the expected value method.

E(X) = Σ xᵢpᵢ

where pᵢ = each probability.

xᵢ = cash reward for each probability.

There are two ways to go about this.

Approach 1

If the contestant attempts question 1 first.

The possible probabilities include

1) The contestant misses the question 1 and cannot answer question 2 = P(A') = 0.40; cash reward associated = $0

2) The contestant gets the question 1 and misses question 2 = P(A n B') = P(A) × P(B') = 0.6 × 0.2 = 0.12; cash reward associated with this probability = $200

3) The contestant gets the question 1 and gets the question 2 too = P(A n B) = P(A) × P(B) = 0.6 × 0.8 = 0.48; cash reward associated with this probability = $300

Expected reward for this approach

E(X) = (0.4×0) + (0.12×200) + (0.48×300) = $168

Approach 2

If the contestant attempts question 2 first.

The possible probabilities include

1) The contestant misses the question 2 and cannot answer question 1 = P(B') = 0.20; cash reward associated = $0

2) The contestant gets the question 2 and misses question 1 = P(A' n B) = P(A') × P(B) = 0.4 × 0.8 = 0.32; cash reward associated with this probability = $100

3) The contestant gets the question 2 and gets the question 1 too = P(A n B) = P(A) × P(B) = 0.6 × 0.8 = 0.48; cash reward associated with this probability = $300

Expected reward for this approach

E(X) = (0.2×0) + (0.32×100) + (0.48×300) = $176

Approach 2 is the better approach to follow as it has a higher expected reward.

The contestant should try and answer question 2 first to maximize the expected reward.

Hope this helps!!!

3 0
3 years ago
CORRECT ANSWER PLEASE!!!!! 150 points
juin [17]

Answer: -7

Step-by-step explanation:

First, lets use the functions to find the answer to f(-8) and g(4)

f(-8) is the same as asking for the value of y when x is -8

Therefore, f(-8) = -5 (according to the graph)

Using the same rule, g(4) would be the value of y when x = 4 which,

according to the graph, g(4) = 3

Plug these values back into the original equation to get:

-1*f(-8)-4*g(4)=?\\=-1*-5-4*3\\

using the order of operations, we will multiply the values first

(-1*-5)+(-4*3)\\=5+(-12)\\=5-12\\=-7

<h2>Therefore, our final answer is -7</h2>
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Katen [24]
The answer is 10 dollars
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3 years ago
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