Ineed these ! -3b + 1 = 3b -5 question 3 (1 point) (1/2)t + 7 = (3/2)t - 4 question 4 (1 point) -2.3 + 1.2x = 5.9 - 2.9x question 5 (1 point) -7y -21 = -3y - 21

1) b=1

-3+1=3b-5

Add 3b to both sides.

1=6b-5

Add 5 to both sides

6=6b

Divide both sides by 6

b=1

2) t=11

(1/2)t+7=(3/2)t-4

Subtract 1/2t from both sides.

7=t-4

Add 4 to both sides.

t=11

3) x=-0.878

-2.3 +1.2x=5.9-2.9x

Subtract 1.2x from both sides

-2.3=5.9-4.1x

Add 5.9 to both sides.

3.6=-4.1x

Divide by -4.1

x=-0.878

4)No solution

-7y-21=-3y-21

Add 3y to both sides.

-4y-21=-21

Add 21 to both sides

-4y=0

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step-by-step explanation:

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb