Martín ha gastado $30 comprando un libro para su madre y un CD de música para él. Al pagar, Martín ha usado:

x billetes de $10
8 monedas más de ¢50 que billetes de $10
El doble de monedas de ¢25 que de ¢50
Expresa el número de monedas de ¢25 y de ¢50 con las que ha pagado Martín en función de x, el número de billetes de $10.

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reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

if the pizza is divided equally into 2 equal halves then you would get

πr^2/2

where r is the radius of the pizza.

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first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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step-by-step explanation: