Answer:
here
Step-by-step explanation:
ratio:
1x, 3x, 5x=180
9x=180
x=180/9
x=20
forgot to mention 1x=cement
3x=sand and 5x=gravel.
I only know first part of the question.
5/6 multiply by 2 up and down to make dominator equal then add the nominator 5 and since down is equal it is 5/6 hope this helps
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
The answer to the question you are looking for is B
