Here is a list of numbers. -45
-21
-16
12
33
40
a) Write down two numbers from the list that add up to -9.
b) Write down two numbers from the list that have a difference of 29.
c) Work out the sum of all the numbers in the list.
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(a): -21 and 12.

(b): -45 and -16

(c): 3.

Step-by-step explanation:

(a): -21 + 12 = -9.

(b): -45 - -16 = 29.

(c): -45 + -21 + -16 + 12 + 33 + 40 = 3.

597

step-by-step explanation:

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: