15/-12 x 9 =?

Explain properly or will be reported!

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9