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S_A_V [24]
3 years ago
10

Evaluate the expression. r = <5, 9, -4>, v = <3, 3, -8>, w = <9, -6, -1> v ⋅ w (5 points)

Mathematics
1 answer:
oee [108]3 years ago
7 0

Answer:

s

Step-by-step explanation:

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How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution?
elena-s [515]

Suppose you add x liters of pure water to the 10 L of 25% acid solution. The new solution's volume is x + 10 L. Each L of pure water contributes no acid, while the starting solution contains 2.5 L of acid. So in the new solution, you end up with a concentration of (2.5 L)/(x + 10 L), and you want this concentration to be 10%. So we have

\dfrac{2.5}{x+10}=0.1\implies25=x+10\implies x=15

and so you would need to add 15 L of pure water to get the desired concentration of acid.

8 0
3 years ago
Please help me i need help with this please give me the answer
vichka [17]

Part A:

$8.00+(r⋅$1.40)

Part B:

($26.00-($8.00)÷$1.40)=5

He can go on 5 rides.

8 0
2 years ago
A cylindrical rain barrel has a radius of 2 feet and holds a total of 30 cubic feet of water. How tall is the rain barrel? Use 3
enot [183]

Answer:

2.39 feet

Step-by-step explanation:

we know that

The volume of a cylinder is equal to

V=\pi r^{2}h

where

r is the radius of the base of the cylinder

h is the height of the cylinder

we have

V=30\ ft^3

r=2\ ft

\pi =3.14

substitute

30=(3.14)(2^{2})h

Solve for h

30=(3.14)(4)h

h=30/12.56

h=2.39\ ft

7 0
3 years ago
How can I rewrite this in exponential form and then evaluate it?
Vedmedyk [2.9K]

QUESTION:- EVALUATE THE EXPRESSION

EXPRESSION:-

{( \sqrt[6]{27 {a}^{3}  {b}^{4} } )}^{2}

<h3>ANSWER-></h3>

{( \sqrt[6]{27 {a}^{3}  {b}^{4} } )}^{2}  \\ {( {27 {a}^{3}  {b}^{4} } )}^{ \frac{2}{6} }  \\ {({27 {a}^{3}  {b}^{4} } )}^{ \frac{ \cancel{2}}{ \cancel6 {}^{ \:  3} } } \\ {(27)}^{ \frac{1}{3} }  {a}^{ \frac{3}{3} }  {b}^{ \frac{4}{3} } \\{(3)}^{ \frac{ \cancel3}{ \cancel3} }  {a}^{ \frac{ \cancel3}{ \cancel3} }  {b}^{\frac{3 + 1}{3} } \\3a {b}^{ \frac{ \cancel3}{ \cancel3} }  {b}^{ \frac{1}{3} } \\ ANSWER->3ab \sqrt[3]{b}  \:  \:  \:  \:  \: or \: \: 3a {b}^{ \frac{4}{3} }

6 0
2 years ago
What’s the answer to 10,11,12, and 13
Naddik [55]

sorry misread the question

3 0
1 year ago
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