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msheehan4737
02.01.2021 •
Mathematics
If 2a+4b=5 and a is equal to three times b, what is 3a?
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Ответ:
3A = 3(1 1/2) = 4 1/2
Step-by-step explanation:
2A + 4B = 5
A = 3B
2(3B) + 4B = 5 [substitute the A for the 3B]
10B = 5 so B = 1/2 [now plug the info in]
2A + 4(1/2) = 5
2A + 2 = 5 [subtract 2 from both sides of the equation]
2A = 3 [divide by 2 to isolate A]
A = 3/2 [now plug in the answers to check your work]
2(3/2) + 4(1/2) = 5
6/2 + 4/2 = 3 + 2 = 5
Ответ:
f(2) = 14
Step-by-step explanation:
Step 1: Define
f(x) = 2x³ - 2
f(2) = x = 2
Step 2: Substitute and evaluate
f(2) = 2(2)³ - 2
f(2) = 2(8) - 2
f(2) = 16 - 2
f(2) = 14