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belka [17]
2 years ago
11

A vendor at a formers market is selling honey. He has 1,450 jars in total of alfalfa, blueberry, and clover honey. He has 130 mo

re jars of alfalfa honey than blueberry honey. He has twice as many jars of clover honey as alfalfa honey. How many jars of alfalfa honey does he have?
Mathematics
1 answer:
soldier1979 [14.2K]2 years ago
7 0

Step-by-step explanation:

x = jars of alfalfa

y = jars of blueberry

z = jars of cover

x + y + z = 1450

x = y + 130

z = 2x

the easiest is now to turn the main equation into an expression of one variable (I am going for x).

for this let's transform the second equation

x = y × 130

y = x - 130

so now we have expressed y and z as terms of x.

back to the main equation :

x + x - 130 + 2x = 1450

4x = 1580

x = 395

he has 395 jars of alfalfa honey.

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An electrician leans an extension ladder against the outside wall of a house so that it reaches an electric box 23 feet up. The
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The length of the ladder that makes an angle of 75 degrees and lies against the wall of a house that's 23 feet tall is <em>approximately </em>25.88 feet.

The ladder forms a right triangle as it lies against the wall as shown in the image below.

<em><u>Thus:</u></em>

x = length of the ladder (hypothenuse)

Reference angle (\theta) = 75^{\circ}

25 ft = Opposite

Apply SOH:

<em>Thus</em>,

sin(\theta) = \frac{Opposite}{Hypotenuse}

  • Plug in the values

sin(75) = \frac{25}{x}\\\\x = \frac{25}{sin(75)} \\\\\mathbf{x = 25.88}

Therefore, the length of the ladder that makes an angle of 75 degrees and lies against the wall of a house that's 23 feet tall is <em>approximately </em>25.88 feet.

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5 0
3 years ago
In a study of the relationship of the shape of a tablet to its dissolution time, 6 disk-shaped ibuprofen tablets and 8 oval-shap
OLga [1]

Answer:

Step-by-step explanation:

This is a test of 2 independent groups. Let μ1 be the mean dissolution time for disk-shaped ibuprofen tablets and μ2 be the mean dissolution time for oval-shaped ibuprofen tablets.

The random variable is μ1 - μ2 = difference in the mean dissolution time for disk-shaped ibuprofen tablets and the mean dissolution time for oval-shaped ibuprofen tablets.

We would set up the hypothesis.

a) The null hypothesis is

H0 : μ1 = μ2 H0 : μ1 - μ2 = 0

The alternative hypothesis is

H1 : μ1 ≠ μ2 H1 : μ1 - μ2 ≠ 0

This is a two tailed test.

For disk shaped,

Mean, x1 = (269.0 + 249.3 + 255.2 + 252.7 + 247.0 + 261.6)/6 = 255.8

Standard deviation = √(summation(x - mean)²/n

n1 = 6

Summation(x - mean)² = (269 - 255.8)^2 + (249.3 - 255.8)^2 + (255.2 - 255.8)^2+ (252.7 - 255.8)^2 + (247 - 255.8)^2 + (261.6 - 255.8)^2 = 337.54

Standard deviation, s1 = √(337.54/6) = 7.5

For oval shaped,

Mean, x2 = (268.8 + 260 + 273.5 + 253.9 + 278.5 + 289.4 + 261.6 + 280.2)/8 = 270.7375

n2 = 8

Summation(x - mean)² = (268.8 - 270.7375)^2 + (260 - 270.7375)^2 + (273.5 - 270.7375)^2+ (253.9 - 270.7375)^2 + (278.5 - 270.7375)^2 + (289.4 - 270.7375)^2 + (261.6 - 270.7375)^2 + (280.2 - 270.7375)^2 = 991.75875

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b) Since sample standard deviation is known, we would determine the test statistic by using the t test. The formula is

(x1 - x2)/√(s1²/n1 + s2²/n2)

Therefore,

t = (255.8 - 270.7375)/√(7.5²/6 + 11.1²/8)

t = - 3

c) The formula for determining the degree of freedom is

df = [s1²/n1 + s2²/n2]²/(1/n1 - 1)(s1²/n1)² + (1/n2 - 1)(s2²/n2)²

df = [7.5²/6 + 11.1²/8]²/[(1/6 - 1)(7.5²/6)² + (1/8 - 1)(11.1²/8)²] = 613.86/51.46

df = 12

We would determine the probability value from the t test calculator. It becomes

p value = 0.011

d) Since alpha, 0.05 > than the p value, 0.011, then we would reject the null hypothesis. Therefore, we can conclude that at 5% significance level, the mean dissolve times differ between the two shapes

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