The fourth one was the answer
1) ![\overline{JK} \perp \overline{MN}](https://tex.z-dn.net/?f=%5Coverline%7BJK%7D%20%5Cperp%20%5Coverline%7BMN%7D)
2)
is a right angle (perpendicular lines form right angles)
3)
is a right triangle (definition of a right triangle)
4)
and
are complementary (the acute angles of a right triangle are complementary)
Monday = - 2.1 Celcius
Tuesday = 15.2
Wednesday = 5
Thursday = - 4.6
Friday = 0
What was the average temperature for the first week in December?
The average temperature = (- 2.1 + 15.2 + 5 - 4.6 + 0)/5 = (20.2 - 6.7)/5 = 13.5/5 = 2.7°C
Answer:
B. lines BE and CG have to be parallel.
Step-by-step explanation:
Answer:
![cos A = \frac{5}{13}](https://tex.z-dn.net/?f=%20cos%20A%20%3D%20%5Cfrac%7B5%7D%7B13%7D%20)
Step-by-step explanation:
The given triangle, ∆ABC is a right triangle.
To find cos A, we'd need to apply the trigonometric ratio formula, which is cos A = adjacent length/hypotenuse length
From the ∆ given,
AC = adjacent = 15,
BC = opposite = 36
We are not given the hypotenuse length AB.
==>Find the hypotenuse length AB, using the Pythagorean theorem formula:
c² = a² + b²
AB² = 15² + 36² = 225 + 1296 = 1521
AB = √1521
AB = 39
==>Find cos A:
cos A = adjacent/hypotenuse
![cos A = \frac{adjacent}{hypotenuse}](https://tex.z-dn.net/?f=%20cos%20A%20%3D%20%5Cfrac%7Badjacent%7D%7Bhypotenuse%7D%20)
Adjacent = AC = 15
Hypotenuse = AB = 39
![cos A = \frac{15}{39}](https://tex.z-dn.net/?f=%20cos%20A%20%3D%20%5Cfrac%7B15%7D%7B39%7D%20)
![cos A = \frac{5}{13}](https://tex.z-dn.net/?f=%20cos%20A%20%3D%20%5Cfrac%7B5%7D%7B13%7D%20)