X* y = -7
x + y = 12

what are the values of x and y?

The question that you should ask yourself is “what are the factors of -7 that adds up to 12?” And you will find out that 7 is prime so the only factors that could ever be are 7 and 1, however, they don’t add up to 12 so the answer is prime.

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.