Give brainlist if right

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Alex buys a home for $276,400. his home is predicted to increase in value 3.5% each year. what is the predicted value of alex’s home in 25 years? a. 621,357 b. 635,191 c. 653,201 d. 673,415

Which is the standard form for this number? (2 x 10) + (5 x 1) + (8 x 1 10,000 )