赤てきいろのはなあります。 Does this mean the flower is red and yellow?
The sentence should be; 赤く"て"きいろ（黄色）のはな"が" あります。The translation is; There is a / are red and yellow flower/flowers. We don’t use subjects in the singular or plural form very often, so you need to figure that out depending on the context. 
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