math
posted by marko .
can you check if i did these 3 problems right or not:
5 (a+2)
i got: 3
simplify:
5 (x+2)
i got: 3
simplify:
(y3) (4)
i got: 12

If you don't know what the unknowns a, x and y are, you cannot calculate a numerical value.
I think you misinterpreted the problem. Just simplify as follows:
5 (a+2) = 5a 10
5 (x+2) = 5x + 10
etc 
thats what i thought i needed to know what a x and y were? but it was on my test and i got it wrong. now i have to correct but i don't know how. heres how instruction on test are:
find the products:
5 (a+2)
answer choices were:
a) 5a 3
b) 5a +10
c) 5a +2
d) 5a 10
i don't know which is correct
the other 2 problems were not multiple choice. just
simplify:
5(x+2)
(y3)(4) 
find the products:
5 (a+2)
answer choices were:
a) 5a 3
b) 5a +10
c) 5a +2
d) 5a 10
i don't know which is correct
When you multiply a negative by a positive, the product is negative.
5(x+2) = 5x + 10
(y3)(4) = 4y + 12