Question

write 20 formula related to your sallybus and make a chart (of class 7)

Answer 1

Answer:

Step-by-step explanation:

take square both sides

(ax+by)^2 = xy

ax^2+by^2+2axby = xy

now 2axby is constant so we can neglect it

hence prove

Answer 2

formulas
1.profit=sp-cp
2.loss=cp-sp
3.profit%=profit/c.p×100%
4.loss%=loss/c.p×100%
5.c.p=100/100+profit%×s.p
6.s.p=100+profit%/100×c.p
7.