exam Maths Puzzle Numerical Ability

i am a 5thgrader and i need help with varibles and expreesions can you please help me

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exam Other Question

The length of a rectangular box is 1 inch more than twice the height of the box, and the width is 3 inches more than the height. If the volume of the box is 126 cubic inches, find the dimensions of the box. L=2x+1; H=x; W=x+3, V=126 cu. in. 3(x-2)+2=2(x-4)

-7x=-26+6x

7x+3>9x-5

I=Prt solve for r

This is from Beginning Algebra by John Tobey, Jeffrey Slater
6th edition