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a chemist has two alloys one of which id 10% gold and 15% lead and the other of which is 30% gold and 40% lead. how many grams of each of the two alloys should be used to make an a

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how do I solve, everything in the parenthesis is raised to the -4th power

(-7a^2b^3c^0)^-4
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( 3a^3b^4c^3) The Honda auto complex has a first cost of $400,000, annual O&M costs of $40,000, salvage value in year 80 of $2,000,000, warehouse renovation every 5 years costing $30,000 (but no