Multiply the
`- 7 st,-1-13 st ^(2)`

Find the equation of the st.line joining the points (3,-1) and (2,3) . Also find the equation of another st.line perpendicular to this st.line and passing through (5,2) .

Calculate the amount that will be posted to the income and Expenditure Account for the year ended 31st March 2019: {:(,,"Rs"),("Stock of Stationery on 1st April 2018",,"30,000"),("Creditors for Stationery on 1st April 2018",,"20,000"),("Advance paid for Stationery carried forward from the year ended 31st March 2018",,"2,000"),("Amount paid for Stationery during the year ended 31st March 2019",,"1,08,000"),("Stock of Stationery on 31st March 2019",,"5,000"),("Creditors for Stationery on 31st March 2019",,"13,000"),("Advance paid for Stationery on 31st March 2019",,"3,000"):}

In a school there are two prizes for excellence in Mathematics (1 st and 2 nd ) two in Chemistry (1 st and 2nd) and only one in Physics (1st). In how many ways can these prizes be awarded to 20 students?

48% of the 1st number is 60% of the 2nd number. What is the ratio of the 1st number to the 2nd number?

Calculate the amount of stationery that will be debited to Income and Expenditure Account for the year ended 31st March 2019: " (a) Amount paid for stationery during the year ended 31st March 2019 "" "54,000 "Stock of stationery in hand on 31st March 2019 "" "2,500 " (b) Stock of stationery on 1st April 2018 "" "15,000 " Payment made for stationery during the year ended 31st March 2019"" "54,000 " Stock of stationery in hand on 31st March 2019 "" " 2,500

Calculate the ratio of energies of He^(+) for 1^(st) & 2^(nd) excited state.