One card is randomly selected from a shuffled standard deck of 52 cards and then a quarter is flipped. find the probability of obtaining a black card and a head on the quarter.

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).

Can someone me out here number 4 plz

Angle that produces maximum distance