Mariah collects 3 spiders each spider has eight legs. brian gives her 1more spider. how many legs do mariah's spiders have altogether?

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

Question 10jur's car can travel 340 miles on 12 gallons. jack's car can travel 390 miles on16 gallons. which person has the best mileage (miles per gallon) and what istheir mileage?

What effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.