Braden has 10 red model cars, which are 2/5 of the total number of cars in his collection. how many cars does braden have in his collection?

a) 4
b) 10
c) 25
d) 50

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).