Determina o valor de k para cada uma equações do 2º grau seguintes, tal que: a) x²+x+k = 0 não tenha soluções.
b) x²+kx+1 = 0 não tenha uma solução.
c) kx²+2x-4 = 0 tenha duas soluções.
d) -3x²+kx-3 = 0 tenha uma solução

Abag has more green balls than blue balls, and there is at least one blue ball. let bb represent the number of blue balls and let gg represent the number of green balls. let's compare the expressions 2b2b and b + gb+g. which statement is correct? choose 1

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Acompany wants to reduce the dimensions of its logo by one fourth to use on business cards. if the area of the original logo is 4 square inches, what is the area of the logo that will be used on the business cards?