What is 3x-8=4. Solve for x. Explain.

Can someone pls ! pls answer all. no explanation needed..

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.