1. the sum of a constant of five
with a coefficient of negative
three and a constant of seven is
equal to the sum a coefficient of
four with a constant of negative
eight and a coefficient of six.

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.

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

The sum of two numbers is 86, and their difference is 20. find the two numbers