Cross-multiplying is when you have two fractions, and you multiply the numerator of each fraction by the other fractions's denominator. In other words, if you have two fractions a/b and c/d, cross-multiplying would be finding a*d and b*c.
If a/b=c/d, then ad = bc.
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It can be either irregular or regular depending on which cross you mean. A cross as in the X symbol is regular, as is the + (plus) sign. The traditional cross associated with Christianity is not
The end line do you mean the endzone????
Traverse means "to cross". It's origin is the French word "traverser" which means "to cross".
The NEVER cross each other
It means that they intersect and share a common point.