A student incorrectly used the distributive property and wrote $6\left(7x+2\right)=42x+2$6(7x+2)=42x+2.
Which of the following is the best explanation to help the student correct their error?
They have have multiplied the wrong term in the sum by $6$6. They should multiply $2$2, instead of $7x$7x, by $6$6.
They have forgotten to multiply the second part of the sum, $2$2, by the number outside the brackets, $6$6.
They have multiplied $7x$7x and $6$6 rather than adding them.
They have added $7x$7x and $6$6 rather than multiplying them.
Expand the expression $5\left(s+7\right)$5(s+7).
Expand the expression $9\left(5+w\right)$9(5+w).
Expand the expression $3\left(r-6\right)$3(r−6).