dakodahepps
25.07.2019 •
Mathematics
The sum of three numbers is 75. the third number is 2 times the first. the second number is 9 less than the first. what are the numbers?
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Ответ:
z = 2x. y = x - 9.
Eliminate y and z by substitution: x + (x - 9) + (2x) = 75
Then 4x = 75 + 9, or 4x = 84. x = 21, y = 21 - 9 = 12, and z = 2(21) = 42.
Check: Do 21, 12 and 42 add up to 75?
Ответ:
11.5 ft tall
Step-by-step explanation: