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It can be 1 x 20 or 2 x 10 or 4 x 5
product of 3 x 15
0.75
A number that can only form one rectangular array would be one that has only two factors, which means it is a prime number. The factor pairs show the different rectangular arrays that can be formed. 2 = 1 x 2 3 = 1 x 3 5 = 1 x 5 7 = 1 x 7 4 = 1 x 4 and 2 x 2, so it can form two. 6 = 1 x 6 and 2 x 3, so it can form two. 8 = 1 x 8 and 2 x 4, so it can form two. 9 = 1 x 9 and 3 x 3, so it can form two. 10 = 1 x 10 and 2 x 5, so it can form two.
x/3 + x = 4 times all by 3 x +3x = 12 add the two x's together 4x=12 divide by 4 x=3 test your work 3/3 + 3 =4 1+3=4 4=4