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3 years ago

(-3x-7)+(4x+7) 2(x+14)+(2x-14) (11x-8)+7(x-1)

Mathematics

1 answer:

inn [45]3 years ago

3 0

Guessing you want to simplify each,
first one goes to just x
second goes to 4x
third goes to 18x-15

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Solve 4 [5 (12+3)-2]-7 PLSSS HELP MEEE

viva [34]

Answer:

285

Step-by-step explanation:

4(5x15-2)-7

4(75-2)-7

4x73-7

292-7

285

3 0

2 years ago

A book costs $ 25.00. You have a coupon for 30 % off. Calculate the final price of the book with a 5% GST. (Begin by finding the

guapka [62]

Answer:

$18.375 or rounded = $18.38 (brainliest if correct)

Step-by-step explanation:

25.00- 7.5 = $17.5

5% of 17.5 = 0.875

17.5 +0.875 = 18.375

6 0

2 years ago

A gardener wants to create a rectangular vegetable garden in a backyard. She wants it to have a total area of 120 square feet, a

Andru [333]

Ima say 10 by 12 for the garden

3 0

3 years ago

Mac has 1/4 hour left of track practice and must be completed 8 laps around the track before he leaves which equation can be use

telo118 [61]

Answer:

(a) $Unit = \frac{1}{4}/8$

Step-by-step explanation:

Given

$Time = \frac{1}{4}$

$Lap = 8$

Required

Determine the time in each lap

The unit time in each lap is calculated by dividing the total time by the number of laps; i.e.;

$Unit = \frac{Time}{Lap}$

Substitute values for Time and Lap

$Unit = \frac{1}{4}/8$

5 0

2 years ago

A study of pollutants showed that certain industrial emissions should not exceed 2.3 parts per million. You believe a particular

Musya8 [376]

Answer:

$t=\frac{3.3-2.3}{\frac{0.4}{\sqrt{9}}}=7.5$

The degrees of freedom are given by:

$df=n-1=9-1=8$

And the p value would be:

$p_v =P(t_{(8)}>7.5)=0.0000346$

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly higher than 2.3 ppm the safe limit

Step-by-step explanation:

Information provided

$\bar X=3.3$ represent the sample mean in ppm

$s=0.4$ represent the sample standard deviation

$n=9$ sample size

$\mu_o =2.3$ represent the value to verify

$\alpha=0.05$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

System of hypothesis

We want to verify if the true mean is higher than 2,3 ppm, the system of hypothesis would be:

Null hypothesis: $\mu \leq 2.3$

Alternative hypothesis: $\mu > 2.3$

The statistic for this case is given by:

$t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

Replacing the info given we got:

$t=\frac{3.3-2.3}{\frac{0.4}{\sqrt{9}}}=7.5$

The degrees of freedom are given by:

$df=n-1=9-1=8$

And the p value would be:

$p_v =P(t_{(8)}>7.5)=0.0000346$

Since the p value is lower than the significance level we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly higher than 2.3 ppm the safe limit

6 0

3 years ago