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2 years ago

Find the difference of the two expressions. (23x+2)−(13x−4)

Mathematics

1 answer:

AlekseyPX2 years ago

3 0

Answer:

x = -0.6 or 6/10

Step-by-step explanation:

(23x + 2) = (13x - 4)

23x + 2 - 2 = 23x

13x - 4 - 13x = -4

23x - 13x = 10x

-4 - 2 = -6

10x = -6

divide each by 10

10x / 10 = x

-6 / 10 = -0.6

x = -0.6 or 6/10

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ms.kirk drove 164 miles in the morning and 219 miles in the afternoon.estimate the total number of miles she drove that day.

Licemer1 [7]

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165+220=385 or 160+220=380

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3 years ago

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After John worked at a job for 10 years, his salary doubled. If he started at $x, his salary after 10 years is _____. $1/2x $x +

dlinn [17]

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3 years ago

Hello! can you please, help me by finding some missing angles.

yuradex [85]

Answer:

Going horizontally,

Q1 a) x = 133°

Q1 b) x = 59°

Q1 c) x = 189°

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Workings out:

To work out the interior angles, you need to know that angles on a straight line add up to 180°. In addition, you also need to know that angles around a point add up to 360°. When you need to find a missing angle, if the angle is on a line or in a triangle, take whatever value/values the angle/angles you have are and take it away from 180°. If the angle is around a point, (or in a square, where all angles are the same anyway) add however many values you have for the angles then take that away from 360°. Hope this helps! :)

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3 years ago

The loaves of rye bread distributed to a local store by a certain bakery have an average length of 30 centimeters and a standard

cupoosta [38]

Answer:

79.91% of loaves are between 26.94 and 32.18 centimeters

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 30, \sigma = 2$