What is this equation called and how do I do it?

DE ≈ 40

Step-by-step explanation:

Using the Sine rule in Δ DEF

∠ D = 180° - (58 + 87)° ← sum of angles in a triangle

∠ D = 180° - 145° = 35° , then

= = ( cross- multiply )

DE × sin35° = 23 × sin87° ( divide both sides by sin35° )

DE = ≈ 40 units ( to the nearest whole number )

answer: a.   one is a factor of every whole number since every number is divisible by itself.

location: point 0

step-by-step explanation:

well, -8 to 10 on a number line is 18 spaces.

1/9 of 18 is 2.

so, 4/9 of 18 must be 8.

8 spaces from -8 (a) is 0.

so, 4/9 of the way from -8 to 10 is 0!