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jasenka [17]
3 years ago
8

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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7 0
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, <u>x</u> 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

8 0
2 years ago
Determine the slope of the line that passes through each pair of points. <br>A (0,1) ,B (2,7)
valkas [14]
Your answer should be 3

Use this formula to solve slopes:

m = (y2<span> – y</span>1) / (x2<span> – x</span>1<span>) </span>
8 0
3 years ago
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