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3 years ago

I don’t understand can you please explain how you got this answer my answer keep being low than these

Mathematics

1 answer:

disa [49]3 years ago

3 0

Answer:

189

Step-by-step explanation:

The pyramid has four triangular faces and a square base.

The area of a triangle is half its base times its height. The base of each triangle is 7, and the height of each triangle is 10. So the area of each triangle is A = ½ (7) (10) = 35.

The area of a square is the side length squared. The side of the square is 7. So the area of the square is A = (7)² = 49.

The total surface area is:

A = 4(35) + 49

A = 189

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Determine the percentage change if the price of an item goes from 2.25 to 1.80

Annette [7]

Answer:25%

Step-by-step explanation:

1. increase=new number-original number

increase=2.25-1.80

increase=0.45

2. increase %= increase÷ original number × 100

%= 0.25× 100

%=25

5 0

3 years ago

If n ll m, find the value of x and the value of z.

aliina [53]

Answer: A

Explanation: the two triangles are proportional, so find the “proportion” between the two sides
12/4=3
3*3=9
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3 years ago

Mariana solved a linear equation and found that it had an infinite number of solutions. Which could have been the final line of

Fofino [41]

Answer:

0=0

Step-by-step explanation:

Well, the linear equation can be expressed as y=ax+b in the solution of linear equations, there 3 main cases can be concluded as final lines. 1st case - the linear equation has no solution (for example, 0*x=5 has no solutions). 2nd case - the linear equation has one solution (for example 4*x=3 where the only one solution is x=0.75) and the 3rd case - the linear equation has infinite number of solutions (for example 0*x=0). So, in our case (3rd case) the last line can be concluded as 0=0.

4 0

3 years ago

Deluxe River Cruises operates a fleet of river vessels. The fleet has two types of vessels: A type-A vessel has 60 deluxe cabins

bixtya [17]

Answer: It should be used 2 for type-A and 3 for type-B to minimize the cost.

Step-by-step explanation: As it is stipulated, x relates to type-A and y to type-B.

Type-A has 60 deluxe cabins and B has 80. It is needed a minimum of 360 deluxe cabins, so:

60x + 80y ≤ 360

For the standard cabin, there are in A 160 and in B 120. The need is for 680, so:

160x + 120y ≤ 680

To calculate how many of each type you need:

60x + 80y ≤ 360

160x + 120y ≤ 680

Isolating x from the first equation:

x = $\frac{360 - 80y}{60}$

Substituing x into the second equation:

160( $\frac{360 - 80y}{60}$ ) + 120y = 680

-3200y+1800y = 10200 - 14400

1400y = 4200

y = 3

With y, find x:

x = $\frac{360 - 80y}{60}$

x = $\frac{360 - 80.3}{60}$

x = 2

To determine the cost:

cost = 42,000x + 51,000y

cost = 42000.2 + 51000.3

cost = 161400

To keep it in a minimun cost, it is needed 2 vessels of Type-A and 3 vessels of Type-B, to a cost of $161400

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3 years ago

Determine the slope of the line that passes through each pair of points. A (0,1) ,B (2,7)

valkas [14]

Your answer should be 3

Use this formula to solve slopes:

m = (y2 – y1) / (x2 – x1)

8 0

3 years ago