Energy and mass are related by the formula E = mc².
m is the mass of the object
c is the speed of light
Solve the equation for the mass of the object, m.

m=E/c².

Step-by-step explanation:

Transposing the formula

E=mc²

we divide both sides by c² then cancel out where necessary so m would stand alone

E/c²=mc²/c²

cancelling c² on the right hand side, equation becomes

m= E/c²

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8

actually your concept is wrong

step-by-step explanation:

150% of x =300

150x=300×100

x=(300×100)÷150

x=200