If E and D are midpoints of ABC, find CB.
A. 3.1
B. 4.4
C. 5.2
D. 8.8

CB is 8.8 ⇒ D

Step-by-step explanation:

In any triangle, the line segment joining the mid-points of two sides is parallel to the 3rd side and equal to half its length

In the given figure

∵ ABC is a triangle

∵ E and D are the midpoints of sides AC and AB

∵ CB is the 3rd side

→ By using the rule above

∴ ED // CB

∴ ED = CB

∵ ED = x + 0.7

∵ CB = 3x - 2.3

→ Substitute them in the equation above

∴ x + 0.7 =   (3x - 2.3)

∴ x + 0.7 =   (3x) -   (2.3)

∴ x + 0.7 = 1.5x - 1.15

→ Subtract 1.5x from both sides

∵ x - 1.5x + 0.7 = 1.5x - 1.5x -1.15

∴ -0.5x + 0.7 = -1.15

→ Subtract 0.7 from both sides

∵ -0.5x + 0.7 - 0.7 = -1.15 - 0.7

∴ -0.5x = -1.85

→ Divide both sides by -0.5

∴ x = 3.7

→ Substitute x by 3.7 in the expression of CB

∵ CB = 3(3.7) - 2.3

∴ CB = 11.1 - 2.3

∴ CB = 8.8

here you hope this .

step-by-step explanation:

hypotenuse = √(15² + 8²)

=  √(225 +64)

=  √(289) = 17

sin(x) = cos(y) = 8/17

they are identical so long as you are doing the sine of one angle and the cosine of the only other angle that isn't the right angle.

you'll just earn points here

step-by-step explanation: