Sum means to add and difference means to subtract.
start by thinking of 2 numbers that add to 40.
check if they also subtract to 10.

is this multiple choice?

a. "to practice" is the best phrase to complete the sentence.

explanation:

during the summer, she likes to practice her soccer skills so that she is ready to play in the fall.

(note that : all the other options "the practicing of", "practice for" and "to do a practice on" are inappropriate as they make the sentence grammatically incorrect.)

motion can be transfered from one object to another by having an objetct in motion push or hit it

particulars about treasure island, from the beginning to the end, keeping nothing back but the bearings of the island, and that only because there is still treasure not yet lifted, i take up my pen in the year of grace and go back to the time when my father kept th

explanation: