MATHEMATICS HIGH SCHOOL

The graph of an inequality has an open circle at 3.9, and the ray moves to the right. What inequality is graphed?x > 3.9
x ≤ 3.9
x < 3.9
x ≥ 3.9

Answers

Answer 1
Answer: The answer would be x> 3.9
Answer 2
Answer:

Answer:

x>3.9

Step-by-step explanation:

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You want to produce a scale drawing of your living room, which is 21 ft by 28 ft. If you use a scale of 5 in. = 7 ft, what will be the dimensions of your scale drawing?

Answers

If 5 in represents 7ft, then 21 ft will be represented by (21 * 5) / 7 = 15 in and 28ft will be represented by (28 * 5) / 7 = 20 in.
Hence the dimension of the scale drawing will be 15 in by 20 in.

Biologists are treating a lake contaminated with bacteria. The level of contamination is changing at a rate of dN/dt=-1110/t² -230 bacteria percubic centimeter per day, where is the number of days since treatment began. Find a function N(t) to estimate the level of contamination if the
level after I day was 5380 bacteria per cubic centimeter.

Answers

Answer: the function N(t) to estimate the level of contamination in the lake is:

N(t) = -1110 ln(t) - 230t + 1110 ln(I) + 230I + 5380

Step-by-step explanation: ∫ dN/dt dt = ∫ (-1110/t² -230) dt

N(t) = -1110 ln(t) - 230t + C  

N(I) = -1110 ln(I) - 230I + C = 5380

C = 1110 ln(I) + 230I + 5380

amita decides that she wants the molds to have a square base from originally having a rectangular prism with a volume of 28 cubic centimeters - how many possible molds can she use

Answers

Given:
rectangular prism = 28 cubic cm
convert to square based or cube

volume of rectangular prism = length * width * height
volume of a cube = a³

√28 = 3.03658897188

Amita can use 3 possible molds that are square based.

Please help and NO LINKSTo conduct a survey about the type of phone service most people in Greenville prefer, 10 different blocks in the neighborhood are chosen. On these 10 blocks, 10 houses are selected at random, and then one resident of each of those houses is interviewed. This type of sampling method is

A.) simple random sampling.
B.) stratified sampling.
C.) systematic random sampling.
D.) cluster sampling.

Answers

Answer:

Please help and NO LINKS

Please help and NO LINKSTo conduct a survey about the type of phone service most people in Greenville prefer, 10 different blocks in the neighborhood are chosen. On these 10 blocks, 10 houses are selected at random, and then one resident of each of those houses is interviewed. This type of sampling method is(A)

Step-by-step explanation:

(Ihopethishelps)(BRAINLEISTPLEASE)❤☺️☻♨️

Answer:

Cluster sampling

Step-by-step explanation:

AI-generated answer

The sampling method described in the question is cluster sampling. In cluster sampling, the population is divided into clusters or groups, and then a random sample of clusters is selected. In this case, the blocks in the neighborhood are the clusters.

Here is a step-by-step explanation of why this is cluster sampling:

1. The first step is to divide the population into clusters. In this case, the population is the neighborhood, and the clusters are the different blocks within the neighborhood.

2. Next, a random sample of clusters is selected. The question states that 10 different blocks in the neighborhood are chosen. This means that the researchers randomly selected 10 blocks from the neighborhood.

3. Once the clusters are selected, a sample is taken from each cluster. The question states that on these 10 blocks, 10 houses are selected at random. This means that within each of the 10 selected blocks, 10 houses are chosen randomly.

4. Finally, the residents of each selected house are interviewed. This means that every resident of each of the selected houses is interviewed to gather information about the type of phone service they prefer.

Overall, this sampling method is cluster sampling because the population is divided into clusters (blocks), a random sample of clusters (10 blocks) is selected, and then a sample is taken from each selected cluster (10 houses on each block).

An SUV costs $27,070 and costs an average of $0.18 per mile to maintain. A hybrid model of the SUV costs $32,880 and costs an average of $0.13 per mile to maintain. After how many miles will the cost of the gas-only SUV exceed the cost of hybrid?

Answers

Answer:

116,200 km

Step-by-step explanation:

Here we have 2 cars, each one with it's corresponding costs. Let's write each cost as functions. The SUV costs $27,070 plus $0.018 per mile. Let x be the miles and SUV (x) the SUV's cost:

SUV(x)=27070+0.18x

We can do the same for the hybrid with a cost function H(x):

H(x)=32880+0.13x

We now need the cost of the SUV to be greater than the hybrid. This is SUV (x)> H(x):

27070+0.18x > 32880+0.13x

Let's subtract 27070 in each side:

0.18 x > 32880 - 27070 + 0.13x

Now let's subtract 0.13x in both sides:

0.05x > 5810

Divide both by 0.05:

x > 5810/0.05

x > 116,200

So, after 116,200km the SUV will turn to be more expensive.

Does the amount of gas in a car depend on how many miles have been driven Or do the number of miles driven depend on the amount of gas in the car? Explain

Answers

Answer:

The amount of gas in a car depend on how many miles have been driven.

Step-by-step explanation:

The number of miles driven is proportionally related to the number of gallons of gas because every  measure of gallons of gas can be multiplied by to get every corresponding measure of miles driven.

Also,

The number of miles driven is the dependent variable

Because the number of miles you can drive depends on the number of gallons of gas you have in your tank.

So, The correct answer is -  The amount of gas in a car depend on how many miles have been driven.
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