Answer:


Step-by-step explanation:
Given:
The given expressions are.

We need to find x and y values.
Solution:
Equation 1⇒
Equation 2⇒ 
First solve the equation 1 for y.
--------(3)
Substitute
in equation 2.

Simplify.



Add 16 both side of the equation.



Divide Numerator and denominator by 5.

Substitute x value in equation 3 and simplify.





.
Therefore, the value of
and
.
1.) To find the surface area, we want to find the area of each side, then add them all up together:
Area of base=lwA=(5)(5)A=25 cm²
Area of triangle=1/2bhA=(1/2)(5)(12.5)A=31.25 cm²
Since the 4 triangles have the same area, we can multiply the area we found by 4 and then add the area of the square:
SA=(4)(31.25) + 25SA=125+25SA=150 cm²
2.) <span>To find the volume use the formula:
V=(1/3)lwh
V=(1/3)(5)(5)(12.5)
V=104.167 cm^3</span>
Answer:
21
Step-by-step explanation:
21
Convenience sample because it was easier for the researcher to go to.