what is the value of s in the equation 3r = 10 + 5s, when r = 10?\n4\n8\n100\n200

Explanation:

Step1: Substitute r value

Substitute $r = 10$ into $3r=10 + 5s$. We get $3\times10=10 + 5s$, which simplifies to $30=10 + 5s$.

Step2: Isolate the term with s

Subtract 10 from both sides. $30-10=10 + 5s-10$, resulting in $20 = 5s$.

Step3: Solve for s

Divide both sides by 5. $\frac{20}{5}=\frac{5s}{5}$, so $s = 4$.

Answer:

A. 4