How would you solve this

Option B

Step-by-step explanation:

Angle SDE is an exterior angle. This question can be solved it two ways;

1. Find the m∠ FDE through the definition of Linear Pair, subtracting 115 from 180, and then through the ∑ of ∠s in Δ Theorem, solve for the value of x. Substitute into " 3x + 19 " and solve for the measure of DFE.

2. Apply the Exterior Angles Theorem and make m∠ SDE ( Exterior Angle ) equivalent to the sum of it's remote interior angles DFE and DEF. Given their measures to be 3x + 19 and 5x, we can solve for the value of x. Substitute into " 3x + 19 " and solve for the measure of DFE.

For the simplicity, I would consider the second option;

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐

r and t.

both are 64 degrees.