kittenlover5031
08.07.2019 •
Mathematics
Abcd is an isosceles trapezoid with ad ii bc, mzb = 60°, and mzc = (3x +15) solve for x.
a 15
b. 25
c. 35
d. 60
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Ответ:
A 15
Step-by-step explanation:
In an isosceles trapezoid, each pair of base angles is congruent.
In this isosceles trapezoid, angles B and C are congruent, so their measures are equal.
m<B = m<C
60 = 3x + 15
Subtract 15 from both sides.
45 = 3x
Divide both sides by 3.
15 = x
x = 15
Ответ:
42 = x - 4(x - 1)...distribute thru the parenthesis
42 = x - 4x + 4 ...combine like terms on the right side
42 = -3x + 4 ...subtract 4 from both sides
42 - 4 = - 3x
38 = -3x ...divide both sides by -3
-38/3 = x