quantos numeros de tres algarismos menores que 700 podem ser formados com os digitos 4,5,6,7 e 8, considerando que: a)os algarismos podem se repetir b) os algarismos nao podem se repetir

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Determine if the solution set for the system of equations shown is the empty set, contains one point or is infinite. x + y = 5 x + y = 7 {} 1 solution infinite