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What property justifies that 6x+9/3=2x+3? A. Commutative Property of Addition B. Commutative Property of Multiplication C. Distributive Property D. Addition of Like Terms
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4 months ago
harry, regan and kelan share £450 in the ratio 2 : 5 : 3 . how much money does kelan get?
General
4 months ago
One pump can empty a pool in 4 days, whereas a second pump can empty the pool in 10 days. How long will it take the two pumps, working together, to empty the pool? (Fractional answers are OK.)
General
4 months ago
Black perch are ocean fish found on reefs near shore. A graduate student at CSULB is interested in testing whether black perch from two different populations behave differently, on average. In her experiment, she measured routine swimming velocity (to the nearest 0.001 cm/s) for 18 fish from one population, and 21 fish from another. a) Which statistical test would you use to analyze these data?
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4 months ago
A study was conducted to determine if the salaries of elementary school teachers from two neighboring districts were equal. A sample of 15 teachers from each district was randomly selected. Test the claim that the salaries from both districts are equal. Use significance 0.05 and assume that the data are distributed normally. n x¯ s District 1: 15 $28,900 $2,300 District 2: 15 $30,300 $2,100 3A. What is the appropriate set of hypotheses (H0, H1)? • µ1 – µ2 = 0, µ1 – µ2 ≠ 0 • µ1 – µ2 ≠ 0, µ1 – µ2 = 0 • µ1 – µ2 = 0, µ1 – µ2 < 0 • µ1 – µ2 = 0, µ1 – µ2 > 0 3B. What is the correct confidence interval? • (–2475, –325) • (–2100, –700) • (–2975, 175) • (–3125, 325) 3C. Are the salaries of the teachers from the two districts different? • Yes. • No. • Sometimes. • Depends on distribution.
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4 months ago
a. Suppose that a single card is selected from a standard 52-card deck. What is the probability that the card drawn is a spade?b. Now suppose that a single card is drawn from a standard 52-card deck, but it is told that the card is black.What is the probability that the card drawn is a spade?
General
4 months ago
Which graph shows the solution to the system of linear inequalities?y < 2x – 5y > –3x + 1On a coordinate plane, 2 straight lines are shown. The first solid line has a negative slope and goes through (0, 1) and (1, negative 2). Everything to the right of the line is shaded. The second dashed line has a positive slope and goes through (0, negative 5) and (2, negative 1). Everything to the right of the line is shaded.On a coordinate plane, 2 straight lines are shown. The first dashed line has a negative slope and goes through (0, 1) and (1, negative 2). Everything to the right of the line is shaded. The second solid line has a positive slope and goes through (0, negative 5) and (2, negative 1). Everything to the right of the line is shaded.On a coordinate plane, 2 straight lines are shown. The first solid line has a negative slope and goes through (0, 1) and (1, negative 2). Everything to the left of the line is shaded. The second dashed line has a positive slope and goes through (0, negative 5) and (2, negative 1). Everything to the left of the line is shaded.On a coordinate plane, 2 straight lines are shown. The first dashed line has a negative slope and goes through (0, 1) and (1, negative 2). Everything to the left of the line is shaded. The second solid line has a positive slope and goes through (0, negative 5) and (2, negative 1). Everything to the left of the line is shaded. HELP ME PLEASE HURRY
General
4 months ago
A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95 % confidence interval for the true proportion of all voters in the state who favor approval. A) 0.435 < p < 0.508 B) 0.444 < p < 0.500 C) 0.471 < p < 0.472 D) 0.438 < p < 0.505
General
4 months ago
A tire company measures the tread on newly-produced tires and finds that they are normally distributed with a mean depth of 0.98mm and a standard deviation of 0.35mm. Find the probability that a randomly selected tire will have a depth less than 0.70mm. Would this outcome warrant a refund (meaning that it would be unusual)?
General
4 months ago
Sixty-four tickets are issued for a schooldance, and 96 brownies are ordered forthe refreshment table. Each student getsthe same number of tickets as everyother student. Each student also gets thesame number of brownies as every otherstudent.Each student will get — tickets and _brownies.
General
4 months ago
2x-5=3x^2 find the root of X
General
4 months ago
Hey, can I please get some help with this? It shouldn’t be too hard, thanks!
General
4 months ago
The manager of a movie theater found that Saturdays sales were $3675. He knew that a total of 650 tickets were sold on saturday. Adult tickets cost $7.50, and children tickets cost $4.50. How many of each kind of ticket were sold?
General
4 months ago
4. Which ratios form a proportion? Use cross products to test each pair.A. 9/17 27/50B. 12/35 24/75C. 15/55 33/121D. 12/35 20/70
General
4 months ago
Which of the following points is a solution to a system of linear equationsy<3x+5y>-2/3x-3 _a.(3,14)b.(3,9)c.(3,-14)d.(3,-9)
General
4 months ago
The sum of the first ten terms of a particular arithmetic sequence is four times the sum of the first five terms of the sequence. What is the ratio of the first term to the second term? Express your answer as a common fraction.
General
4 months ago
Please help! The question is in the picture!
General
4 months ago
The speed limit posted on a local highway is 75 mph. Is the average speed on that stretch of highway significantly more than 75mph? Forty vehicle’s speeds were recorded by speed detection devices. What would be the correct alternative hypothesis?
General
4 months ago
Which expression is equivalent to 1/5(15+10x-5)
General
4 months ago
It has been observed that some persons who suffer acute heartburn, again suffer acute heartburn within one year of the first episode. This is due, in part, to damage from the first episode. The performance of a new drug designed to prevent a second episode is to be tested for its effectiveness in preventing a second episode. In order to do this two groups of people suffering a first episode are selected. There are 55 people in the first group and this group will be administered the new drug. There are 45 people in the second group and this group will be administered a placebo. After one year, 11% of the first group has a second episode and 9% of the second group has a second episode. Conduct a hypothesis test to determine, at the significance level 0.1, whether there is reason to believe that the true percentage of those in the first group who suffer a second episode is different from the true percentage of those in the second group who suffer a second episode? Select the [Rejection Region, Decision to Reject (RH0) or Failure to Reject (FRH0)] A. [ z < -1.65, RHo] B. [ z < -1.65 and z > 1.65, FRHo C. [z > 1.65, FRHo] D. [z < -1.65 and z > 1.65, FRHo] E. [z > -1.65 and z < 1.65, RHo] F. None of the above
General
4 months ago
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