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tresset_1 [31]
3 years ago
13

Helphelphelphelphelphelphelp

Mathematics
1 answer:
adoni [48]3 years ago
6 0

Answer:

P = 1,-10

Q=1,-1

R=7,-1

S=7,-10

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Hey guys pls help <br> help me Find the Area of the Rhombus
Hatshy [7]

Answer:

210 m²

Step-by-step explanation:

The area of a rhombus is d₁ * d₂ * 0.5. In other words, the area is its diagonals multiplied together and divided by 2.

Substitute the measures of the diagonal given.

35 * 12 * 0.5 = 210

The area is 210 m²

I hope this helps! Feel free to ask any questions!

Why is (D₁ + D₂)/2 incorrect?

This is a really helpful link:

http://mathandmultimedia.com/2015/03/04/why-the-area-of-a-rhombus-half-the-product-of-its-diagonals/

https://byjus.com/maths/area-of-rhombus/

7 0
3 years ago
sales at a local ice cream shop went up 30% in 5 years. if 18,000 ice cream cones were sold in that current year, find the numbe
Setler79 [48]

Answer:

13,846\ cones

Step-by-step explanation:

Let

x -----> the number of ice cream cones sold 5 years ago

Remember that

100\%+30\%=130\%=130/100=1.3

we know that

Sales 5 years ago, multiplied by the 30% increase should equal 18,000 ice cream cones.

so

The linear equation that represent this problem is

1.30x=18,000

Solve for x

Divide by 1.3 both sides

x=13,846\ cones

6 0
2 years ago
The swimming pool at Spring Valley High School is a rectangle with a width of 70 meters and a length of 25 meters. Around the pe
erik [133]
<h3>Answer:   4w^2+190w</h3>

================================================

Explanation:

Check out the attached image below. Specifically, take a look at figure 1. We start with a rectangle which is 70 meters by 25 meters. Then we extend this rectangle out by adding two copies of w to each dimension having the larger rectangle be (70+2w) meters by (25+2w) meters.

The original smaller rectangle has area of 70*25 = 1750 square meters.

The new larger rectangle area is a bit more tricky to figure out, though its not too bad once you get the hang of it. You could use the FOIL rule to get

(70+2w)(25+2w) = 70*25+70*2w+2w*25+2w*2w

(70+2w)(25+2w) = 1750+140w+50w+4w^2

(70+2w)(25+2w) = 1750+190w+4w^2

(70+2w)(25+2w) = 4w^2+190w+1750

Or you could use the box method shown in figure 2.

The idea is to write the terms of (70+2w) and (25+2w) along the edges of the box. Then filling out the 4 inner boxes involves multiplying the outer terms. Example: row1,column2 has 50w inside it because we multiply the outer terms 25 and 2w to get 25*2w = 50w. The other boxes are filled out in a similar fashion.

Although the FOIL rule is handy and taught in a lot of math books/classes, I prefer the box method because the box method can be extended to other cases (not just multiplying two binomials).

Whichever method you use, the larger rectangle has area 4w^2+190w+1750 square meters.

-------------------------------

So,

A = area of larger rectangle = 4w^2+190w+1750

B = area of smaller rectangle = 1750

C = difference in areas of A and B

C = A - B

C = ( A ) - ( B )

C = ( 4w^2+190w+1750 ) - ( 1750 )

C = 4w^2+190w+1750-1750

C = 4w^2+190w

This represents the area of just the tile border alone. We started with the larger rectangle and took out the smaller rectangle inside to only have the border left over.

-------------------------------

If you want, you can factor out a 'w' to get

4w^2+190w = w(4w+190)

Though this may be optional.

8 0
3 years ago
How do I solve this system using substitution: y = x + 4; y = 3x
Olin [163]
You just do 
3x=x+4
subtract x from both sides
2x=4
divide 2 from both sides
x=2
y=2+4
y=6
(x,y)= (2,6)
4 0
3 years ago
Read 2 more answers
Part c. And also if I did A &amp; B right.
Bezzdna [24]
Part a. and part b. are definitely correct
To do part c. you have to take into account that a triangle is 180degrees. So angle 1= 70, angle 2= 65 so angle 1+ angle 2+ angle 7=180degrees
angle 7= 180-65-70=45


Ans: 45degrees
7 0
3 years ago
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