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Via inspection, one can factorise this via the difference of squares; since a^2-b^2 = (a+b)(a-b), therefore:100-x^2 = (10-x)(10+x)

1. Yesterday, I went to my friends house and we watched tv - Ayer, fui a la casa de mi amiga y vimos la televisión Next year, we are going to Spain together - El próximo año, vamos a España juntos
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SInce, for y = uv, dy/dx = uv' + vu', where u' = du/dx, therefore:dy/dx = (1sin(x)) + (xcos(x)) = sin(x) + xcos(x)

The first step whenever you are given an equation is to group like terms. By this I mean put all the terms with the same letter next to it together and, in this case, the numbers without a letter. For the...

Place the mould(s) within the drag & fill with casting sand (compact well)
Turn the drag over & place the cope over the drag. Place sprue pins on the bottom of the mould(s) and fill the cope ...