CPhill

y = -5x -18    (1)
3x + 5y = -2   (2)

Sub (1) into (2)

3x + 5[-5x - 18 ] = - 2

3x - 25x - 90  = - 2

-22x =  88  

x = 88/-22 =   -4

And using  (1)  we have

y = -5[(-4) -18] =  20 - 18  = 2

x/-10 < 22    mutliply both sides by -10 and reverse the inequality sign

x  >  - 220

√​12 =

√​[4 * 3 ]  =

√​4 *√​3   =

2√​3

[5 - 4 ] / 4  x 100%   =

1/4  x 100% =

25%

Solve by proportion

(1/4) / 16  = N / 35

1/64  = N / 35    cross-multiply

35 * 1  = 64 * N

35 = 64 * N       divide both sides by 64

35/ 64  teaspoons  = N

log₈ (5x - 13) = log₈ 11

The log bases are the same....so we can solve this

5x - 13  = 11    add 13 to both sides

5x  = 24           divide by 5

x  = 24/ 5

2 * x *x * 3 * y * y * y  =

2 * x^2 * 3 * y^3  =

6x^2y^3

(n - 2) (180) / n  = 120             simplify

180n - 360  = 120n           rearrange

180n - 120n  = 360

60n  = 360  →    n = 6  sides  = hexagon