Answer: D.) Variable
explanation: “Variable, In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation. Commonly used variables include x and y (real-number unknowns), z (complex-number unknowns), t (time), r (radius), and s (arc length).”
See photo for solution and mark me as brainliest if i helped :)
A: although it seems like they are forming a 90º angle, they actually add up to a 89 º angle and therefore are not complementary
B: see photo
2x<10. Twenty characters to make the Brainliacs happy.
Answer:
the first one
Step-by-step explanation:
The first equation is -5m+15
and the first one is 15-5m
Which is basically the same thing.
Glad to help