84 is divided into 7 84/7 =12
and it is added to
9 divided into 3 9/3 =3
12+3=15
Vertical angles are pairs of opposite made by 2 intersecting lines
and adjacent lines are 2 angles that have a common endpoint and common sides
Answer:
Step-by-step explanation:
26% is (26-20)/(50-20) = 6/30 = 1/5 of the way between 20% and 50%. That means 1/5 of the solution is 50% acid.
50% acid: 1/5 · 100 mL = 20 mL
20% acid: 100 mL -20 mL = 80 mL
Delbert must mix 80 mL of 20% acid and 20 mL of 50% acid.
_____
Maybe you'd like to see an equation. Let x represent the amount of 50% acid required. Then 100-x is the amount of 20% acid needed. The amount of acid in the mix is ...
0.50(x) +0.20(100 -x) = 0.26(100)
(0.50 -0.20)x = (0.26 -0.20)100 . . . . subtract 0.20(100)
x = (0.26 -0.20)/(0.50 -0.20)×100 = 20
This last expression should look a lot like the one we started with in this answer. It shows you how you can almost write down the answer to mixture problems without a lot of work.
Answer:
9 
Step-by-step explanation:
When you draw the graph, you find that the points make a square with a side length of 3 units long. The area would therefore be 3x3 = 9.
The product of the algebraic expressions 
and 
is 
. Hence, <u>3rd option</u> is the right choice.
<h3>How do we multiply two algebraic expressions?</h3>
When two algebraic expressions are multiplied, the like terms are to be combined and multiplied, and then they should be written as a single algebraic expression.
<h3>How do we solve the given question?</h3>
In the question, we are asked to find the product of the algebraic expressions and , that is:
()().
To find the product of the two expressions, we combine the like terms:
= 
(Using the law of exponents: 
)
Now we write them as a single expression: .
∴ The product of the algebraic expressions and is . Hence, <u>3rd option</u> is the right choice.
Learn more about the product of algebraic expressions at
brainly.com/question/4344214
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