All categories

1 year ago

You wish to buy a new set of strings for your guitar. You phone five different

Mathematics

2 answers:

Novosadov [1.4K]1 year ago

8 0

Answer:

215,00.

Step-by-step explanation:

Average price = 22500

18000*2 + 28000 + 27000 + x = 22500*5

91000 + x = 112500

X = 21500

Licemer1 [7]1 year ago

6 0

Answer:

R215,00

Step-by-step explanation:

Let x = amount the 5th music shop charges for the strings

$\sf mean=\dfrac{\textsf{sum of all the numbers}}{\textsf{amount of numbers}}$

$\implies \sf 225=\dfrac{180+180+280+270+x}{5}$

$\implies \sf 225\cdot 5=910+x$

$\implies \sf 1125=910+x$

$\implies \sf x=1125-910$

$\implies \sf x=215$

Therefore, the fifth music shop charged R215,00 for the strings.

You might be interested in

Find the exact length of the curve. x=et+e−t, y=5−2t, 0≤t≤2 For a curve given by parametric equations x=f(t) and y=g(t), arc len

Rama09 [41]

The length of a curve C parameterized by a vector function r(t) = x(t) i + y(t) j over an interval a ≤ t ≤ b is

$\displaystyle\int_C\mathrm ds = \int_a^b \sqrt{\left(\frac{\mathrm dx}{\mathrm dt}\right)^2+\left(\frac{\mathrm dy}{\mathrm dt}\right)^2} \,\mathrm dt$

In this case, we have

x(t) = exp(t ) + exp(-t ) ==> dx/dt = exp(t ) - exp(-t )

y(t) = 5 - 2t ==> dy/dt = -2

and [a, b] = [0, 2]. The length of the curve is then

$\displaystyle\int_0^2 \sqrt{\left(e^t-e^{-t}\right)^2+(-2)^2} \,\mathrm dt = \int_0^2 \sqrt{e^{2t}-2+e^{-2t}+4}\,\mathrm dt$

$=\displaystyle\int_0^2 \sqrt{e^{2t}+2+e^{-2t}} \,\mathrm dt$

$=\displaystyle\int_0^2\sqrt{\left(e^t+e^{-t}\right)^2} \,\mathrm dt$

$=\displaystyle\int_0^2\left(e^t+e^{-t}\right)\,\mathrm dt$

$=\left(e^t-e^{-t}\right)\bigg|_0^2 = \left(e^2-e^{-2}\right)-\left(e^0-e^{-0}\right) = \boxed{e^2-\frac1{e^2}}$

5 0

2 years ago

Caleb spent 34.95 on 5 pounds of coffee. how much was the coffee per pound?

horsena [70]

It would be $6.99. All you have to do is divide the total (34.95) by pounds of coffee (5). 34.95 / 5 will give you 6.99! You can check this by doing 6.99 * 5, which would again give you 34.95. Contact me if you need any more help. :^)

4 0

3 years ago

Find the number of terms in the sequence and find the sum of the sequence: 5+9+13+...+145

SashulF [63]

145-13-9-5 that what your looking for

8 0

1 year ago

Help me please!!!!!!!!!!!!

asambeis [7]

Angle 4 is 144
180- angle 3 (36degrees) = 144 degrees

6 0

2 years ago