Answer: 2
-7 - (-9) could be visualized as -7 + 9
-7 + 9 is 2
Answer:1
1. 
2. ∠ABC = 120°, ∠BCD = 90°, ∠CDA = 60°, ∠DAB = 90°
Step-by-step explanation:
It's important to note here that the measure of all interior angles in a quadrilateral will add up to 360°
We know this using the formula
, a 4 sided figures angles will add up to

This means that all of the angles (4x, 3x, 2x, 3x) will add up to 360.

Combine like terms:

Divide both sides by 12:

We know now substitute x for 30 in for all of the side lengths.
∠ABC = 4x =
°
∠BCD = 3x =
°
∠CDA = 2x =
°
∠DAB = 3x =
°
Hope this helped!
Answer:
She is incorrect. The correct answer is 285.74
Step-by-step explanation:
A= (pi)r^2
Training wheel: A= (3.14)(3)^2=28.26in^2
Wheel: A= (3.14)(10)^2= 314in^2
314-28.26=285.74in^2
Answer: second option
Step-by-step explanation:
Direct variation equation has the following form:

Where "k" is the constant of variation.
In direct variation when the variable "x" increases, the variable "y" increases in proportion to "x" and when the variable "x" decreases, the variable "y" decreases in proportion to "x".
You can observe in the table that when "x" increases, "y" increases, therefore it is a Direct variation.