Estimate 38.6+4.3 to the nearest 10​

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Point r divides in the ratio 1 : 5. if the coordinates of e and f are (4, 8) and (11, 4), respectively, what are the coordinates of r to two decimal places?