Which equation represents a proportional relationship that has a constant proportionality equal to 0.7 Y/x=7/10

Y/x=1/7

XY=7/10

XY=1/7

first option

Step-by-step explanation:

The equation representing a proportional relationship is

y = kx ← k is the constant of proportion

Here k = 0.7, thus

y = 0.7x ← is the required equation

Given

= ( cross- multiply )

10y = 7x ( divide both sides by 10 )

y = x = 0.7 x ← the required equation

angle addition postulate

2x=56

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.