The last one because its like turning it into a fraction but your putting as a desamile or how ever you spell it
Answer:
d = 3x²+ 4x - 7
C'est la réponse j'espère que ça aide.

<span>Representing in fraction for the best understanding
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When the exponent is negative, the inversion is made, the numerator becomes the denominator, and the denominator becomes the numerator, and the change of signal from the exponent, which was negative, becomes positive.
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Answer:
c.-1/6
1 hr = 60 mins
10 hr = ... mins
600 mins + 39 mins = ... mins
639 mins + 24 sec=......mins
91 cm × 24 = ...
IDK what convention factors are tho...