Like now im timed.. will give ! in the figure, δabc ~ δdef. solve for x. triangles abc and def. angles b and e are congruent and measure 39 degrees. ab measures 20. bc measures 24. ef measures 6. de measures x. x = 5 x = 12 x = 4 x = 7.2

Use CPCTC
Congruent Parts of a Congruent Triangle are Congruent

∠B ≅ ∠E
AB ≅ DE
BC ≅ EF

AB = 20
BC = 24
EF = 6
DE = x

20/24 = x/6

Solve for x, cross multiply

24(x) = 20(6)
24x = 120
24x/24 = 120/24
x = 120/24
x = 5

x = 5, or A is your answer

hope this helps

4x^2y^2 - 2y^4 - 8xy^3 + 9x^3y + 6y^4 - 2xy^3 - 3x^4 + x^2y^2 =

lets combine like terms...
-3x^4no other like terms
6y^4 - 2y^4 = 4y^4
4x^2y^2 + x^2y^2 = 5x^2y^2
-8xy^3 - 2xy^3 = -10xy^3
9x^3y...no other like terms

standard form : -3x^4 + 9x^3y + 5x^2y^2 - 10xy^3 + 4y^4