The sum of a number xx and 4 equals 12. an equation that represents this sentence is

1 answer:

5 0

X + 4 = 12

This is because the question gives you everything you require for this sentence to be formed. 12 is the final answer. 4 is added on and $x$ is basically the number that is to be found.

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Help giving brainliest

wolverine [178]

Answer:

Q1: 12.5

Q3: 16

IQR: 3.5

Step-by-step explanation:

Mean : 14.25

Median : 13.5

Mode : 13, 12

Range: 6

Minimum :12

Maximum: 18

Count n: 8

Sum: 114

Quartiles Quartiles:

Q1 --> 12.5

Q2 --> 13.5

Q3 --> 16

Interquartile

Range IQR: 3.5

Outliers: none

8 0

2 years ago

You want to get from a point A on the straight shore of the beach to a buoy which is 54 meters out in the water from a point B o

anyanavicka [17]

Answer:

$x =\dfrac{45 \sqrt{6}}{ 2}$

Step-by-step explanation:

From the given information:

The diagrammatic interpretation of what the question is all about can be seen in the diagram attached below.

Now, let V(x) be the time needed for the runner to reach the buoy;

∴ We can say that,

$\mathtt{V(x) = \dfrac{70-x}{7}+\dfrac{\sqrt{54^2+x^2}}{5}}$

In order to estimate the point along the shore, x meters from B, the runner should stop running and start swimming if he want to reach the buoy in the least time possible, then we need to differentiate the function of V(x) and relate it to zero.

i.e

The differential of V(x) = V'(x) =0

= $\dfrac{d}{dx}\begin {bmatrix} \dfrac{70-x}{7} + \dfrac{\sqrt{54^2+x^2}}{5} \end {bmatrix}= 0$