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6.5 and 9.5, red weighs 12g and blue weighs 15g

Step-by-step explanation:

1:

Difference of 3 means we have x and x+3

They sum to 16 so we have x + x + 3 = 16

2x=13

x=6.5

So we have 6.5 and 9.5

2:

Red marbles weigh r grams and blue marbles weigh b grams.

3r+2b=66

r+4b=72

Double the top equation to get

6r+4b=132

r+4b=72

Calculate the difference

(6r+4b)-(r+4b)=132-72

5r=60

r=12

r+4b=72 so 12+4b=72

4b=60

b=15

(1)let no. be x and y

x+ y= 16

x-y= 3

adding both eqn= x+y+x-y=16+3

2x=19

x= 19/2

now..19/2+y=16

y=16-19/2= 13/2

(2)let red balls weight = x...blue balls weight= y

3x+2y=66gbag 1

x+4y=72gbag 2

by egn 2...x= 72-4y

puuting x value in eqn 1= 3(72-4y)+2y=66

216-12y+2y=66

y= 15 g...weight of a blue ball

now...x= 72-4y

x=72-4×15=12g...weight of a red ball

ye

step-by-step explanation:

8(-10x+3.5y-7)

8×-10x + 8×3.5y + 8×-7

-80x + 28y - 56

therefore

-80x+28y-56 is the correct answer