Elena used math facts as an anchor to find the sum of 5 and 7. Her work is shown.

Step 1: The phrase "sum of” means addition.
Step 2: 5 + 5 = 10
Step 3: Since 7 is 2 more than 5, 2 more need to be added to 10.
Step 4: Therefore, 5 + 7 = 8.

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:

v = 1/3 a^2h

step-by-step explanation:

if the height is 57.7cm and the height of the slant edge is 18.2cm, then the volume is 1/3 a^2h.

9x