Answer:
x = 1.8
Step-by-step explanation:
5x - - 5x makes 5x+5x which is equal to 10x
10x+21= 39
-21 -21
10x= 18
10x/10 = 18/10
x = 1.8
8 can go into 12 only once.
Answer:
i believe it only has one solution, which would be x=12.
Step-by-step explanation:
.55km x 5 days = 2.75km
.55km x 1.4 = .77km x 2 = 1.54km
2.75km + 1.54km = 4.29km in one week.
X^2+7x-30
what we do is we find what 2 number multiply to get -30 and add to get 7
factor 30
30=2 times 3 times 5
we know that is has to be negative eventually so one is negative and one is positivie so we do2 factors and add
2 times 5=10
10 and -3
add
10-3=7
checks
10 times -3=-30
so we put those in
(x-3)(x+10)
factored