Find the surface of this composite solid.

a. 152 m^2
b. 120 m^2
c. 136 m^2
d. 104 m^2

B

Step-by-step explanation:

The surface area of this solid is the sum of all the surfaces.

There are 4 rectangular surfaces all around, each measuring 4 by 5 m.

So area of 4 of these surfaces is: 4 * (4*5)= 4 * 20 = 80

The bottom is a rectangle with dimensions 4 and 4. So area is 4 * 4 = 16

There are 4 triangular faces in the top portion, each with base 4 and height 3. Area of triangle is 1/2 * base * height. Hence,

Area of 4 of these triangles is 4*[(1/2)*4*3] = 4 * 6 = 24

Thus, the surface area = 80 + 16 + 24 = 120 m^2

Answer choice B is right.

13

step-by-step explanation:

distance formula is d=√(x2-x1)^2   +   (y2-y1)^2

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: