Posted by **susie** on Friday, June 29, 2007 at 9:08pm.

A rectangle has sides of 3x 4 and 7x + 10. Find the expression that represents its perimeter.

3x-4+7x+10=

3x+7x=10x

−4+10= 14

10x+14

that is my answer please help

You just added two sides, a rectangle has four sides. So the perimeter should be twice what you calculated. However, you have several errors.

-4+10=-6

So you should have gotten 10x-6, however, that needs to be doubled (you only added two sides).

## Answer this Question

## Related Questions

- Math - Find the equation of the tangent line 5x^2+y^2=14 at (1,3). P.S: It's ...
- how about his one - -7+ 5x = 10x-2? im not sure I know its -1, but im not sure ...
- calculus - f(x,y)=x^2+2y^2 use the gradient vector f(5, 1) to find the tangent...
- Math - Alg - How much pure acid must be added to a 30% acid solution to make a ...
- math - A rectangle has sides of 4x 4 and 8x + 10. Find the expression that ...
- math - A rectangle has sides of 3x 4 and 7x + 10. Find the expression that ...
- Math! - 1) What is the value of 19 + 5a^4 + 3b^2 when a = 2 and b = -4? (this ...
- math, drbob222 - For this problem is it only asking for the exprssion(formula). ...
- maths - A student says that the perimeter of a rectangle with length 2x-1inches ...
- math,factoring,help - Can someone please show me step by step how to do these. I...