identify the property that justifies each statement y=-5 then -5=y, 8a+4=4+8a, 12(x+4)=12x+48, 7^2.0=0, 8+(2+6)=(8+2)+6, if 3^2=9and 9=v/81 then 3^2 =v/81, -7=-7. need help please and thanks in advance.​

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?