-12u - 7v + 20u + 13v = ?

Solution

v = {-2, 1}

Step-by-step explanation:

Set the factor '(-2 + -1v)' equal to zero and attempt to solve:

Simplifying

-2 + -1v = 0

Solving

-2 + -1v = 0

Move all terms containing v to the left, all other terms to the right.

Add '2' to each side of the equation.

-2 + 2 + -1v = 0 + 2

Combine like terms: -2 + 2 = 0

0 + -1v = 0 + 2

-1v = 0 + 2

Combine like terms: 0 + 2 = 2

-1v = 2

Divide each side by '-1'.

v = -2

Simplifying

v = -2

Subproblem 2

Set the factor '(1 + -1v)' equal to zero and attempt to solve:

Simplifying

1 + -1v = 0

Solving

1 + -1v = 0

Move all terms containing v to the left, all other terms to the right.

Add '-1' to each side of the equation.

1 + -1 + -1v = 0 + -1

Combine like terms: 1 + -1 = 0

0 + -1v = 0 + -1

-1v = 0 + -1

Combine like terms: 0 + -1 = -1

-1v = -1

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45

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: