If she is bringing 2/3 to school, then she is not bring 1/3
1/3 (45) = 45/3 = 15.....so she is not bringing 15 cookies
or u can do it this way...
she is bringing 2/3...
2/3(45) = 90/3 = 30 ....she is bringing 30
45 - 30 = 15....not bringing 15.
Given that the isosceles triangle has sides √45, √45 and x.
The triangle has a height of 3 units.
We need to determine the value of x.
<u>Value of x:</u>
The value of x can be determined using the formula,

Where b is the base of the triangle, a is the sides of the isosceles triangle and h is the height of the triangle.
Substituting
,
and
in the above formula, we get;

Squaring the terms, we have;

Subtracting, we get;



Thus, the value of x is 12
Hence, Option B is the correct answer.
You could sort them by how many sides the figure has, then it would be split up into 2 groups, one group with 4 sides and another with 3
area for the hexagon = 1/2*p*a
p = perimeter = 18*6=108
a = apothem = 15.59
108*15.59 = 1683.72/2 = 841.86 sq units
Area of rectangle = 18 x 21 = 378
841.86-378 = 463.86 rounded to 464 square units