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STALIN [3.7K]
2 years ago
9

A chemist has three different acid solutions. The first acid solution contains 25%

Mathematics
1 answer:
PilotLPTM [1.2K]2 years ago
8 0
Solution:
Let the volume (in litres) of acids used be:
x1=amount of 25% acid
x2=amount of 40% acid
x3=3*x2=amount of 60% acid
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Sifa has $156 in the bank. He needs to have at least $400 for spending money on his trip. Write and solve an inequality to find
gregori [183]
Sifa needs to earn $244

Solution
400-156=244

Therefore, He needs to earn $244 more before his trip.
6 0
2 years ago
A trade magazine routinely checks the​ drive-through service times of​ fast-food restaurants. Upper AA 9595​% confidence interva
Butoxors [25]

Answer:

One can be 95% confident that the drive-through service times of​ fast-food chain is between 169 seconds and 172 seconds.

Step-by-step explanation:

The confidence interval gives a range of value for the population mean or parameter, which is calculated from the statistic value of the data (that is sample statistic). This range gives the interval which is associated with a certain level of confidence for which the interval will contain the true value of the unknown parameter (true value). In the scenario above, the associated confidence level is 95%.Hence, we can be 95% confident that the true value will be continued with the interval (169 ; 172)

6 0
3 years ago
230kilometer what is the speed in miles per hour
sineoko [7]

Answer:

142.92

Step-by-step explanation:

5 0
3 years ago
Solve by Elimination:<br> 8x + 6y = -5<br> 10x + 6y= -13
jonny [76]

Answer:

x= -4 and y= 27/6

Step-by-step explanation:

-(8x + 6y = -5) which converts to -8x -6y = 5

10x + 6y = -13

simplify from there

-8x + 10x = 2x ; -6y + 6y = 0 ; 5 - 13 = -8

soo, now you have

2x = -8

x = -4

then, plug in to find y

8(-4) + 6y = -5

-32 + 6y = -5   add 32 on both sides

6y = 27    divide both sides by 6

y= 27/6 or 4.5

8 0
3 years ago
Evaluate the expression when x=3 and y=-6<br> 7y-x
Alenkasestr [34]
7(-6) - 3
-42 -3
-45
Your answer is -45
8 0
3 years ago
Read 2 more answers
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