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Angelina_Jolie [31]
3 years ago
13

PLz help ASAP (−64)+((−36)+20)

Mathematics
2 answers:
vredina [299]3 years ago
7 0

Answer:-80

Step-by-step explanation:

Juliette [100K]3 years ago
4 0

Answer: -80

Hope that helps

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On a certain​ exam, Tony corrected 20 papers and found the mean for his group to be 70. Alice corrected the remaining 10 papers
son4ous [18]

Answer:

The mean of the combined group is 76.67 ≈ 77

Step-by-step explanation:

  1. The sum of the grades in Tom's group is 20×70 = 1400
  2. The sum of grades in Alice's group is 10×90=900
  3. The sum of gradees in the combined group is =1400+900=2300
  4. Then the mean grade of the combined group is \frac{2300}{30}=76.67

where

  • 2300 is the sum of the all grades in the combined group
  • 30 is the total number of people in the group
4 0
3 years ago
The sum of two numbers is 49 and the difference is 25 . What are the numbers?
OLEGan [10]

Answer:

x = 37 y = 12

Step-by-step explanation:

Let x be one number

Let y = other number

x+y = 49

x-y = 25

Add the equations together

x+y = 49

x-y = 25

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

2x = 74

Divide by 2

2x/2 = 74/2

x =37

x+y = 49

37+y = 49

Subtract 37 from each side

37+y-37 = 49-37

y = 12

4 0
4 years ago
Please help me with this and can you show me how to do it??
Yanka [14]

Answer:

8 ft²

Step-by-step explanation:

Since ΔEFG ~ ΔABC, they are proportionately related. Each of the corresponding sides differ by the scale factor, which shows how much bigger or smaller the new triangle is from the original triangle.

Purple = original triangle, triangle 1

Pink = new triangle, triangle 2

Find the scale factor, "k". It will be a fraction because the triangle gets smaller.

k = FG/BC = 2/3

The scale factor can be used to find a side, the height or the area of the new triangle.

Use the scale factor squared to find the area.

A₂ = (A₁)(k²)

= (18 ft²)(2/3)²

= 7.999...ft²

= 8 ft²

8 0
3 years ago
Can't seem to figure out ​
777dan777 [17]
You can look this up
8 0
3 years ago
How can you use a rate to compare costs of two boxes of cereal that are different sizes
MatroZZZ [7]
A rate shows how much larger or smaller one box is to the other box.
6 0
3 years ago
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