Please help out Solve the formula E=I(R+r) for r
a. r= EI-R
b. r= ER/I
c. r=EIR
d. r= E-IR/I

second one-

Solve the formula a(m-r)+t=s for a

a. a=s(m-r)-t
b. a=s(m-r)+t
c. a=s(m-r)/r
d. a= s-t/m-r

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality