Math

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Write polynomial in standard form:
a)7a²-3b+9a⁴c²-11a²-6-9a⁴c²+d⁵+10b+24a²;
b)(a-6)(-b+7c-3+d);
c)(9m²-6mn)(-73m⁴n⁸k¹¹p⁷);
d)8t³-(12s-14t²)+6t³+9s²t²+12st-21t³+14t²-12st+(-12s-100t³).