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lisabon 2012 [21]
3 years ago
8

X/30 + X/40= 1 Solve for x

Mathematics
2 answers:
Svetllana [295]3 years ago
4 0

Answer:

17 1/7 I think

Step-by-step explanation:

slega [8]3 years ago
4 0

x=17.1

Step-by-step explanation:

\frac{x}{30}  +  \frac{x}{40}  = 1 \\  \frac{3x + 4x}{120}  = 1 \\  \frac{7x}{120}  = 1 \\  \frac{7x}{120} = 1 \\ 7x = 120 \\ x =  \frac{120}{7}   \\ x =17.1

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A museum worker randomly displays 5 historical writings in a row. What is the probability that the worker lines them up from the
Mars2501 [29]

The number of ways to arrange the 5 writings in a row is 5! = 5 * 4 * 3 * 2 * 1 = 120 ways.

There is only 1 way to arrange the writings from oldest to newest.

Therefore, the probability is 1/120.

4 0
3 years ago
What is the precent of 15 is 12
kati45 [8]
100%/x%=12/15
<span>(100/x)*x=(12/15)*x       - </span>we multiply both sides of the equation by x
<span>100=0.8*x       - </span>we divide both sides of the equation by (0.8) to get x
<span>100/0.8=x </span>
<span>125=x </span>
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8 0
3 years ago
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Marisol has enough tile to cover a square portion of her patio with an area of 225 ft2. What will be the side lengths of her des
Anit [1.1K]

Answer:

Side lengths = 15 ft²

Step-by-step explanation:

Given:

Area of square = 255 ft²

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Side lengths

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Area of square = side x side

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4 0
3 years ago
What is the distance between (5,10) and (5,2)?
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5 0
3 years ago
HELP Sam measures the height of 7 different scoops of ice cream. The mean of the heights was 3.8 cm. Which of the following best
OLga [1]

Sam measures the height of 7 different scoops of ice cream. The mean height was 3.8 cm. If all the scoops are evenly distributed, they would all be 3.8 cm tall.

<h3>How to find the mean value of a data set?</h3>

The mean value of the data set is the ratio of the sum of the data set's values to the number of values it has.

If the data set consists of values

x_1, x_2, ..., x_n

, then we get the mean value as:

\overline{x} = \dfrac{x_1 + x_2 + \cdots + x_n}{n}

Sam measures the height of 7 different scoops of ice cream. The mean height was 3.8 cm.

\overline{x} = \dfrac{x_1 + x_2 + \cdots + x_n}{n}

mean=\dfrac{(a+b+c+d+e+f+g)}{7}

Therefore, If all the scoops are evenly distributed, they would all be 3.8 cm tall.

Learn more about mean;

brainly.com/question/23008823

#SPJ2

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