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What is -4/5+ 7/15 when you simplify ?
General
2 months ago
What is 3 3/4*(-1 1/2)?
General
2 months ago
Solve for x.6x2−2=13
General
2 months ago
The circumference of a circle is 6 pi cm. What is the area of circle
General
2 months ago
Garcia is preparing for his football game. The following table shows a probability model for the number of rushing yards that he will have next game.Is this a valid probability model?
General
2 months ago
Find the solutions to the system of equations. Select all that apply. Y=x^2-1 y=2x-2A.(-1,0)B.(-2,0)C.(1,0)D.(0,1)
General
2 months ago
$4. Is what percent of $100.
General
2 months ago
Hector waters his lawn if it does not rain at least 1 1/2 inches each week. It has already rained 3/8 inch this week. Which inequality represents the number of inches of rain, r, still needed so Hector does not have to water his lawn this week?A. r ≥ 1 7/8B. r > 1 7/8C. r ≥ 1 1/8 D. r > 1 1/8 (The fractions are mixed numbers!!!!)
General
2 months ago
If m^2-5/2m=-11/2,m=Plz answer fast!!!
General
2 months ago
Ten people who visited the vet were asked how many dogs and cats they owned. The results are shown in the table.Use the point tool to create a scatter plot that represents the data shown in the table.Name Number of dogs Number of catsMarco 1 4Linda 2 3Logan 2 0Miriam 0 3Paula 1 1Henrietta 3 1Greg 1 0Quentin 2 1Donovan 0 1Tracy 4 2Number of dogsNumber of catsTen people who visited the vet were asked how many dogs and cats they owned. The results are shown in the table.Use the point tool to create a scatter plot that represents the data shown in the table.Name Number of dogs Number of catsMarco 1 4Linda 2 3Logan 2 0Miriam 0 3Paula 1 1Henrietta 3 1Greg 1 0Quentin 2 1Donovan 0 1Tracy 4 2Number of dogsNumber of cats
General
2 months ago
find the value of a so that the point (3,a) lies on the line represented by 2x-3y=5
General
2 months ago
The Precision Scientific Instrument Company manufactures thermometers that are supposed to give readings of 0 degrees Celcius at the freezing point of water. Tests on a large sample of these thermometers reveal that at the freezing point of water, some give readings below 0 degrees celcius (denoted by negative numbers) and some give readings above 0 degrees celcius (denoted by positive numbers).Assume that the mean reading is 0 degrees celcius and the standard deviation of the readings is 1.00 degrees celcius. Also assume that the frequency distribution of errors closely resembles the normal distribution. A thermometer is randomly selected and tested. Find the temperature reading corresponding to the given information.If 7% of the thermometers are rejected because they have readings that are too low, but all other thermometers are acceptable, find the temperature that separates the rejected thermometers from the others. I know the answer, but do not how to solve the problem. answ-->-1.48 Find the z-value with a left tail of 7%:invNorm(0.07) = -1.48Find the termperature deviation that corresponds to that z-value:x = z*s + ux = -1.48*1 + 0 = -1.48
General
2 months ago
A certain board game uses tokens made of transparent colored plastic. Each token looks like where each of the four different regions is a different color: either red, green, yellow, blue, orange, purple, or black. How many different tokens of this type are possible? (Note: The white circle is a region.)
General
2 months ago
A company manufactures tennis balls. When its tennis balls are dropped onto a concrete surface from a height of 100 inches, the company wants the mean height the balls bounce upward to be 55.4 inches. This average is maintained by periodically testing random samples of 25 tennis balls. If the t-value falls between minus−t 0.90 and t 0.90, then the company will be satisfied that it is manufacturing acceptable tennis balls. A sample of 25 balls is randomly selected and tested. The mean bounce height of the sample is 56.6 inches and the standard deviation is 0.25 inch. Assume the bounce heights are approximately normally distributed. Is the company making acceptable tennis balls?
General
2 months ago
The mean height of a certain kind of plant is 171 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs from 171. State the null hypothesis and the alternative hypothesis that we would use for this test.
General
2 months ago
finding the exact value of tan Theta for an angle Theta with sine theta equals 5/6 and its terminal side in quadrant 2
General
2 months ago
The campus of a college has plans to construct a rectangular parking lot on land bordered on one side by a highway. There are 680 ft of fencing available to fence the other three sides. Let x represent the length of each of the two parallel sides of fencing. A rectangle has width x. x x (a) Express the length of the remaining side to be fenced in terms of x. (b) What are the restrictions on x? (c) Determine a function A that represents the area of the parking lot in terms of x. (d) Determine the values of x that will give an area between 20 comma 000 and 50 comma 000 ftsquared. (e) What dimensions will give a maximum area, and what will this area be?
General
2 months ago
According to a recent study, some experts believe that 22.22% of all freshwater fish in a particular country have such high levels of mercury that they are dangerous to eat. Suppose a fish market has 150 fish we consider randomly sampled from the population of edible freshwater fish. Use Central Limit Theorem (and the Empirical rule) to find the approximate probability that the market will have a proportion of fish with dangerously high level of mercury that is more than two standard errors above 0.20.You can use Central Limit Theorem because the fish were randomly sampled; the population is more than 10 times 250; and np is 50, and n(1-p) is 200, and both are more than 10.
General
2 months ago
The quadratic formula is used to solve for ???? in equations taking the form of a quadratic equation, ????????2+????????+????=0. quadratic formula:????=−????±√(????^2−4????????)/2????. Solve for ???? in the expression using the quadratic formula. 2????^2+31????−6.1=0. Use at least three significant figures in each answer.
General
2 months ago
A cereal company puts toys into 40% of its cerealboxes. Lydia wants to know what the probability isof getting 2 toys if she buys 7 boxes of cereal. Howcould she simulate her question using a randomnumber table?a. Look at the first 2 digits in the table. Let digitsfrom 0 to 7 represent getting a toy, and otherdigits represent not getting a toy.b. Look at the first 7 digits in the table. Let digitsfrom 1 to 3 represent getting a toy, and otherdigits represent not getting a toy.c. Look at the first 7 digits in the table. Let digitsfrom 0 to 3 represent getting a toy, and otherdigits represent not getting a toy.d. Look at the first 2 digits in the table. Let digitsfrom 1 to 7 represent getting a toy, and otherdigits represent not getting a toy.
General
2 months ago
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