Answer:
Yes, it is a proportional relation.
Step-by-step explanation:
Given,
5 text messages a boy sent or received = 7 text messages a girl sent or received,
⇒ 1 text message of a boy = text messages of a girl,
So, x text messages of a boy = text messages of a girl,
Let y represents the text messages of a girl for the x text messages of a boy,
Which is a line,
∵ At (0,0),
( True ),
Thus, line passes through the origin,
Hence,
shows a proportional relation.
Answer:
(a + 2b)(a - b)
Step-by-step explanation:
Assuming you require the expression to be factored
Given
a² +
ab - b² ← factor out
from each term
= (a² + ab - 2b²) ← factor the quadratic
Consider the factors of the coefficient of the b² term(- 2) which sum to give the coefficient of the ab- term (+ 1)
The factors are + 2 and - 1, since
2 × - 1 = - 2 and 2 - 1 = + 1, thus
a² + ab - 2b² = (a + 2b)(a - b) and
a² +
ab - b² =
(a + 2b)(a - b)
Answer:
∠ XYZ ≈ 72.9°
Step-by-step explanation:
Using the tangent ratio in the right triangle
tanXYZ = =
=
, thus
XYZ = (
) ≈ 72.9° to 1 dec. place )