What is the perimeter of the isosceles triangle shown below?
A. 24 units
B. 18 units
C. 21 units
D. 12 units

B. 18 units

Step-by-step explanation:

The triangle can be divided into two right angle triangles whose height is 3 units and the upper width is 4 units.

Using pythagora's theorem to find the slant side (hypotenus) of each right angle triangle

y^2 = 4^2 + 3^2 = 25

y = 5 units.

The total width of the upper side of the triangle is 8 units,

The perimeter is the addition of all the sides of the triangle which is;

8 units + 5 units + 5 units = 18 units

See image below

answer: 140

step-by-step explanation:

so just add all then it will be your answer but i am not pretty sur eif it is but hope this i am here to people

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15