Given, 6 batteries for £2.79
(They are of same type, so each of them are of same cost. )
~Simply divide the total price of 6 batteries by 6 to get the price of each battery,
Thus, cost of each battery is <u>£</u><u> </u><u>0</u><u>.</u><u>4</u><u>6</u><u>5</u><u> </u><u>(</u><u>ans)</u>
<em>Look</em><em> </em><em>at</em><em> </em><em>the</em><em> </em><em>attached</em><em> </em><em>picture</em><em> </em><em>⤴</em>
<em>Hope</em><em> </em><em>this</em><em> </em><em>will</em><em> </em><em>help</em><em> </em><em>u</em><em>.</em><em>.</em><em>.</em>
$=(a^2-10a)-(b^2+6b) +16$
$=[(a^2-2(5)a+25)-25]-[(b^2+2(3)b+9)-9]+16$
$=(a-5)^2-25-(b+3)^2+9+16$
$=(a-5)^2-(b+3)^2$