Which number is prime?

a.
59

b.
51

c.
57

d.
63

I think it's 57

Step-by-step explanation:

63 is a multiple of 3, and the calc on my phone did the rest of the work.

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3