N/5=10. x/1=9 a/5=3 c/7=9 i need to know what the variables are

Which equation can be used to solve for the unknown number? seven less than a number is thirteen. n-7=13 7-n=13 n+7=13 n+13=7

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.