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Flauer [41]
3 years ago
6

Can someone help me pls?

Mathematics
2 answers:
NemiM [27]3 years ago
6 0

Answer:

2) 22in.squared 3) 28in.squared 4) 17 1/2in. squared or 35/2in. squared

Step-by-step explanation:

The one picture is of the formula you use to solve it. See in the case of problem 2.) ,

  • height (h) = 4
  • a= 4
  • b= 7

For number 3) ,

  • h=4
  • a=6
  • b=8

Plug these values into the formula A=1/2 × h (a+b)

Always do a+b first (since they are in parenthesis) and then multiply that by h and 1/2.

Here is the process in the other picture.

It is quite simple once you practice more! The third picture is for you to do and see if you get the same answer I did.

I hope you found what you needed!

Lesechka [4]3 years ago
4 0

Answer:

2) 22  

3) 28

4) 17.5

5) 22

6) 13.5

7) 19.5

8) 11

9) 7.5

Step-by-step explanation:

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I need help plz help me !!
elena-14-01-66 [18.8K]

Answer:

110

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Type the correct answer in the box. express your answer to two significant figures. a reaction between 1.7 moles of zinc iodide
irga5000 [103]

The percent yield of zinc carbonate is 5.91%.

<h3>What is chemical reaction?</h3>

The chemical reaction is the reaction between two reactants which led to the formation of products.

The products are substances which forms after reaction. The reactants are the substances which are original materials.

Given is a reaction between 1.7 moles of zinc iodide and excess sodium carbonate yields 12.6 grams of zinc carbonate.

The given balanced equation is:  Na₂CO₃ + ZnI₂ → 2NaI + ZnCO₃

From given moles of zinc iodide, the moles of zinc carbonate

1.7 moles of ZnI₂ = 1.7 moles of ZnCO₃

Molar mass of zinc carbonate is 125.38 g/mol

Theoretical yield =  1.7 moles of ZnCO₃ x  125.38 g/mol = 213.15 g  ZnCO₃

Theoretical yield is 213.15 g and the actual yield is given as 12.6 g.

percent yield = [ 12.6 g / 213.15 g  ZnCO₃ ] x 100

percent yield = 5.91%

The percent yield of zinc carbonate is 5.91%.

Learn more about chemical reaction.

brainly.com/question/22817140

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7 0
2 years ago
Point K is on line JL. given JL =4x, JK= 2x+3, and KL=x, determine the numerical length of kl​
balandron [24]

Hi! I'm happy to help!

Our total line is JL (4x), and it is split into two parts: JK, and KL. We have our values, and we know that JK+KL=JL, so we can substitute our values and solve for x:

4x=(2x+3)+(x)

4x=3x+3

To solve for x, we have to isolate it on one side of the equation.

First, let's subtract 3x from both sides so that we can isolate x:

4x=3x+3

-3x -3x

x=3

<u>So, our x=3, which means that KL=3.</u>

I hope this was helpful, keep learning! :D

5 0
3 years ago
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