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Rama09 [41]
3 years ago
7

5 -2 (4a + 1) + 3a = 13 what is (a) equal to a) - 6/5 b) - 2 c) 2 d) 6/5

Mathematics
2 answers:
suter [353]3 years ago
8 0
The best answer is a=-2 because I did the math in my head so fast
Sidana [21]3 years ago
4 0
The correct answer is a= -2
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tom's and tim's ages add up to 21 years. In 3 years, Tom will be twice time's age. How old are they now?
Dafna11 [192]
X=Tom´s age
y=Tim´s age.
we suggest this system of equations: 

x+y=21
(x+3)=2(y+3)

We solve this system of equations by susbstitution method.
x=21-y
[(21-y)+3]=2(y+3)
24-y=2y+6
-y-2y=6-24
-3y=-18
y=-18/-3=6

x=21-y
x=21-6=15.

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When it says f(4) that means x=4

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