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3 years ago

Solve the following equation when x = 7. y = 8 + 3x HELP

Mathematics

2 answers:

anastassius [24]3 years ago

5 0

Answer: Y = 29

Step-by-step explanation:

We are given:

X = 7

Y = 8 + 3x

Since we know that the variable X is really the number 7, substitute it in...

Y = 8 + 3x

Y = 8 + 3(7)

Y = 8 + 21

Y = 29

Grace [21]3 years ago

4 0

Answer:

y=29

Step-by-step explanation:

Replace x with 7:

y=8+3(7)

Multiply 7 and 3:

y=8+21

Add together:

y=29

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garri49 [273]

Answer:

Step-by-step explanation:

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3 years ago

Find each unit rate. Round to the nearest hundredth if necessary. <br> 2. 6,840 customers in 45 days

Tanya [424]

Answer:

152 customers a day

Step-by-step explanation:

6840/45=152

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3 years ago

What is the arc length of theta equals 2pi/7 and the radius is 3 cm

nirvana33 [79]

$\bf \textit{arc's length}\\\\ s=r\theta ~~ \begin{cases} r=radius\\ \theta =angle~in\\ \qquad radians\\ ------\\ r=3\\ \theta =\frac{2\pi }{7} \end{cases}\implies s=3\cdot \cfrac{2\pi }{7}\implies s=\cfrac{6\pi }{7}$

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3 0

3 years ago

jack paid $64 for two algebra and three geometry books. he paid $66 for three algebra and two geometry books. what is the cost o

kap26 [50]

Lets make the cost of the algebra textbook = x and the cost of the geometry book = y

2x+3y=64
4x+2y=66

now we get one of these equations in terms of one variable

2x+3y=64 ---> 2x=64-3y ---> x=32-1.5y

now we can plug that numeric value back into the other equation

4(32-1.5y)+2y=66

we can now simplify this equation in order to get the value of y

4(32-1.5y)+2y=66 ---> 128-6y+2y=66 ---> 128-4y=66 ---> -4y=-64 ---> y=16

4 0

3 years ago

A major manufacturing firm producing PCB for electrical insulation discharges small amounts from the plant. We assume that the a

xxTIMURxx [149]

Answer:

a. Z = 2.6667

c. Upper limit = 3.39

Step-by-step explanation:

Part a

We are given

Population mean = 3

Population standard deviation = 0.3

Sample mean = 3.2

Sample size = n = 16

Level of significance = 0.05

Null hypothesis: H0: µ = 3

Alternative hypothesis: Ha: µ > 3

The test statistic formula is given as below:

Z = (sample mean – population mean) / [SD / sqrt(n)]

Z = (3.2 – 3)/[0.3/sqrt(16)]

Z = 2.6667

Part b

Type I error is the probability of rejecting the null hypothesis that the population mean is 3 ppm when actually it is 3 ppm. Type II error is the probability of do not rejecting the null hypothesis that the population mean is 3 ppm when actually it is exceeding 3 ppm. Type II error is the serious in this scenario.

Part c

We are given

Population mean = 3

Population standard deviation = 0.3

Sample mean = 3.2

Sample size = n = 16

Confidence level = 90%

Critical z value = 2.3263

Formula is given as below:

Lower limit =sample mean – z*SD/sqrt(n)

Upper limit = sample mean + z*SD/sqrt(n)

Lower limit = 3.2 – 2.5758*0.3/sqrt(16)

Lower limit = 3.01

Upper limit = 3.2 + 2.5758*0.3/sqrt(16)

Upper limit = 3.39

6 0

3 years ago