Find the value of x.

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30

Step-by-step explanation:

since the 2 sides are congruent, the two angles are congruent, so

75+75+ x= 180

150+x=180

x=30

30

Step-by-step explanation:

Remark

The angle that looks like a shark's fin sticking out of the water is also 75o.  So you have 2 angles that are 75 degrees each. Add them together.

Solution

x + 75 + 75 = 180            All triangles have 180 degrees.

x + 150 = 180                  Subtract 150 from both sides.

x= 180 - 150

x = 30

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)