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Free_Kalibri [48]
3 years ago
15

Help me please I need good grades for a phone!!! <3

Mathematics
1 answer:
irga5000 [103]3 years ago
8 0

Answer:

Can you show the full problem so that I can help

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Choose the student who correctly used substitution to determine if 19 was a solution to the equation. Mara's work Juan's work Ac
Anton [14]

Answer:

Juan’s work is true for those who are un assured enjoy !! ^^

Step-by-step explanation:

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2 years ago
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Find the missing number. show working. 13+?=15+1​
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13+2=15+1=16 that is the answer

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What is two and three fifths plus one and one eighth?
goblinko [34]
2 and 3/5 + 1 and 1/8
First, find the LCM of 5 and 8: 40
Next, make equivalent fractions:
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3 years ago
A television transmitter tower is 400 feet high. if the angle between the guy wire (attached at the top) and the tower is 51.8°,
vova2212 [387]
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8 0
3 years ago
how many liters is 70% alcohol solution must be added to 50 L of 40% alcohol solution to produce a 50% alcohol solution
Anettt [7]

Answer:

50%

Step-by-step explanation:

This question is solved by C1V1 + C2V2 ÷ V1 + V2 = final concentration

Let x = volume of 70% solution

 

let's express the concentrations as decimals, so 70% = 0.7, 50% = 0.5, and 40% = 0.4

 

then 0.7X + 50L.4 ÷ X + 50L = 0.5

 

this equation becomes 0.5(X + 50) = 0.7X + 20

which yields 0.5X + 25 = 0.7X +20

combining, we get 5 = 0.2X, and 25 = X

 

when we mix the two volumes, we get 50L x 40% + 25L x 70%,

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which is a final concentration of 50%

3 0
3 years ago
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