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Natalka [10]
3 years ago
7

During which period did mammals first appear? A. Pleistocene B. Carboniferous C. Cretaceous D. Jurassic

Biology
2 answers:
Sloan [31]3 years ago
7 0
D JURASSIC PERIOD BECAUSE THEY CAME UP WHEN DINOSAURS CAME
kifflom [539]3 years ago
3 0
D.........The Jurassic Period.
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Three lots with parallel side boundaries extend from the avenue to the boulevard as shown answer
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Given;
            x + y + z = 140 meters


According to the proportion theorem,

\frac{x}{40} = \frac{y}{30}

Solving for x, using cross multiplication:

\frac{x}{1} = \frac{40y}{30}

Similarly,

x/40 = z/35

solving for z by cross multiplication,

z = 35x/40
z = 7x/8

Now, the third proportions,
y/30 = z/35

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y = 30z/35
y = 6z/7

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 4y/3 + 6z/7 +  7x/8 = 140

(224y + 144z + 147x)/168 = 140

224y + 144z + 147x = 23520

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224y + (144 × 7x/8) + 147x = 23520

224y + 126x + 147x = 23520

224y + 273x = 23520
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