(10 points and brainliest for best)which number sentence represents the model?

a.−2 1/2+3 1/4=1/4

b.−2 1/2+3 1/4=3/4

c.−2 1/2−3 1/4=3/4

d.2 1/2+3 1/4=3/4

Plz me i need i will give a brain

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?