1) Complete as sentenças: a)No monômio -38xo coeficiente é e a parte literal é

b)No monômio 25ab o coeficiente ée a parte literal é

2) Simplifique as expressões, reduzindo os termos semelhantes:

a) 4a-10a + 7 -7a+ 8a b) (-3x+ 5x – 8) + (6x- 4x – 3)

c) (4x – 5y + 14) – ( 18 – 2x + 8y) d) 3xy + 5x –( 4xy – 12x + 15)

3) Classifique as expressões com base no número de termos:
a) -125xy

b) 13xy + 34ab – 10

c) 65xz -28

d) -45abc + 16xy –xy2 +15

Step-by-step explanation:

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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:

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.