Work out area of this semi circle with diameter 10

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).

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Which rule describes the composition of transformations that maps △abc to △a”b”c