Use mental calculations -- compatible numbers, substitutions, equal products, or equal quotients -- to compute exact answers.
show all steps. indicate which method you are using.
1) 90 / 18
2) 15 x 104
3) 35 x 60
4) 5 x 18 x 4 x 10
5) 82 - 29

Each month, a shopkeeper spends 5x + 14 dollars on rent and electricity. if he spends 3x−5 dollars on rent, how much does he spend on electricity? for which value(s) of x is the amount the shopkeeper spends on electricity less than $100? explain how you found the value(s).

Which of the following is the result of expanding the series

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x