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aleksley [76]
2 years ago
14

An envelope is 7 inches long and 3 inches wide.What is the area of the envelope surface?​

Mathematics
2 answers:
SOVA2 [1]2 years ago
5 0

Answer:

21 in^2

Step-by-step explanation:

Area = Width * Length

Area = 3 * 7

Area = 21

Gekata [30.6K]2 years ago
4 0

Answer:

11. 2/3 inches squared.

Step-by-step explanation:

(3.1/3 * 3.1/2 = 10/3 * 7/2 = 70/6 = 11. 2/3)

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suppose your average, after taking 4 quizzes is 70 out of 100. what must your average be on the next 4 quizzes to increase your
exis [7]

Answer:

94

Step-by-step explanation:

Average = Total / Number of Data

70 \times 4 = 280

You have a total of 280 points after 4 quizzes.

4+4=8 quizzes in total

Total you need for average to be 82

82 \times 8 = 656

Number of points you need to hit required:

656 - 280 = 376

You need 376 points in total for the next 4 quizzes.

376  \div 4 = 94

You need an average of 94 points on the next 4 quizzes.

5 0
3 years ago
The scatter plot below shows the height of a tree over time. What is the approximate height of the tree after 10 years show work
gladu [14]
17ft, you go across x-axis till 10(years) and vertically look up to the line which co-ordinates x-axis with y-axis and look up the height(ft)
3 0
3 years ago
Cos (pi/2 -x) = sin x is this true or false?
Ksenya-84 [330]

The above statement is true meaning cos(π/₂-x)=sin(x)

Step-by-step explanation:

We know that sine and cosine function are mutual cofunctions.

Hence this would mean that these two functions are complimentary of each other meaning cos(π/₂-x) = sin(x)

This can be verified mathematically by assuming “x” as 30°

Hence Cos (π/₂-30°) = cos 60°= 0.5 (from trigonometric table values)

Similarly Sin 30°= 0.5 (from trigonometric table values)

This can be proved through using the formula

Cos(A-B)= Cos A.Cos B + Sin A.Sin B

Here A=90° and b=x°

Putting the values we get (it is to be remembered that cos 90°=0 and sin 90°=1)

Cos 90°.cos x+ sin 90.sin x

0+sinx= sinx

Hence it is proved that cos(π/₂-x)=sin(x)

 

7 0
3 years ago
Find the missing length of the triangle. a= ? b=4 c=12 1/3
Llana [10]

Answer:

a = 12.93

Step-by-step explanation:

Convert to decimal: 12 1/3 = 12.3

Pythagoras (a^2 = b^2 + c^2):

4^2 = 16

12.3^2 = 151.29

16+151.29 = 167.29

a = √167.29

a = 12.93 (rounded to two decimal places)

3 0
2 years ago
Evaluate the expression <br> [6+9 x (4-2)] ÷ 4+2
Sedaia [141]

Answer:

8

Step-by-step explanation:

4-2=2

2x9=18

18+6=24

24/4=6

6+2=8

=8

3 0
3 years ago
Read 2 more answers
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