Nadia is painting the four sides of a rectangular trough. if a can of paint will cover 20 ft2, how many cans will she need to buy to complete the job?

a) 144
b) 133
c) 150
d)160

The correct answer is A. 144 inches².

Correct statement is attached:

Determine the surface area of the figure if the height of the triangular face is 6 inches. The triangles are equilateral.

A. 144 inches²

B. 133 inches²

C. 150 inches²

D. 160 inches²

Step-by-step explanation:

1. Let's review the information provided to us to answer the question correctly:

Height of the triangular face = 6 inches

Length of the long side of the triangular prism = 10 inches

Length of the short side of the triangular prism = 4 inches

The triangles are equilateral

2. Determine the surface area of the figure if the height of the triangular face is 6 inches. The triangles are equilateral.

For calculating the answer, we need to know what is the surface of the five faces of the triangular prism.

We have three rectangular faces and two triangular faces.

Surface area of the rectangular faces = Length * Height

Surface area of the rectangular faces = 10 * 4 = 40 inches²

Surface area of the triangular faces = (Length * Height)/2

Surface area of the triangular faces = 6 * 4/2 = 12 inches²

Now the total surface area of the five sides is:

3 * Surface area of the rectangular face + 2 * Surface area of the triangular face

3 * 40 + 2 * 12 = 120 + 24 =  144 inches ²

The total surface area of the five faces is A. 144 inches ²

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: