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Find each of the following products: (a) `3 xx (-1)` (b) `(-1) xx 225` (c) `(-21) xx (-30)` (d) `(-316) xx (-1)` (e) `(-15 xx 0 xx (-18)` (f) `(-12) xx (-11) xx (10)` (g) `9 xx (-3) xx (-6)` (h) `(-18) xx (-5) xx (-4)` (i) `(-1) xx (-2) xx (-3) xx 4` (j) `(-3) xx (-6) xx (-2) xx (-1)`

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Here, we will use the below rules,
`(+)xx(-) = (-)`
`(-)xx(+) = (-)`
`(-)xx(-) = (+)`
`(+)xx(+) = (+)`

(a)`3xx(-1) = -3`
(b)`(-1)xx225 = -225`
(c)`(-21)xx(-30) = 630`
(d)`(-316)xx(-1) = 316`
(e)`(-15)xx0xx(-18) = 0`
(f)`(-12)xx(-11)xx(10) = 1320`
(g)`9xx(-3)xx(-6) = 162`
(h)`(-18)xx(-5)xx(-4) = -360`
(i)`(-1)xx(-2)xx(-3)xx4 = -24`
(j)`(-3)xx(-6)xx(-2)xx(-1) = 36`

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