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Anuta_ua [19.1K]
3 years ago
5

Help me please. Been stuck on this. :/

Mathematics
2 answers:
alina1380 [7]3 years ago
6 0

Answer:

pi, the square root 72

Step-by-step explanation:

KonstantinChe [14]3 years ago
5 0

Answer:

pi

Step-by-step explanation:

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If y=-12 when x=9, find y when x=-4<br> please answer quickly
pychu [463]

Answer: x=3

Step-by-step explanation:

to make y=-4 from -12 you have to divide by 3. so divide the 9 by 3 to get 3 which is your answer

7 0
2 years ago
How many liters each of a 35% acid solution and a 80% acid solution must be used to produce 60 liters of a 65% acid solution? (R
serg [7]

Solving a system of equations we will see that we need to use <u>40 liters of the 80% acid solution</u>, and the other <u>20 liters are of the 35% acid solution</u>.

<h3>How many liters of each solution do we need to use?</h3>

First, we need to define the variables:

  • x = liters of the 35% acid used.
  • y = liters of the 80% acid used.

We know that we want to produce 60 liters of 65% acid, then we have the system of equations:

x + y = 60

x*0.35 + y*0.80 = 60*0.65

(in the second equation we wrote the percentages in decimal form).

To solve this we need to isolate one of the variables in one equation and then replace it in other one, isolating x we get:

x = 60 - y

Replacing that in the other equation:

(60 - y)*0.35 + y*0.80 = 60*0.65

y*(0.80 - 0.35) = 60*(0.65 - 0.35)

y*0.45 = 60*0.30

y = 60*0.30/0.45 = 40

So we need to use <u>40 liters of the 80% acid solution</u>, and the other <u>20 liters are of the 35% acid solution</u>.

If you want to learn more about systems of equations:

brainly.com/question/13729904

#SPJ1

7 0
1 year ago
Lisa family drove 830.76 miles to visit her grandpaerents.Lisa calculated that they used 30.1 gallons og gas .how many miles per
Irina-Kira [14]
830.76/30.1=27.6 miles
7 0
3 years ago
A recipe uses 7 parts of milk for every 5 parts of sugar how much sugar do you use when you use 28 cups of milk
stira [4]

Answer:

the answer is 20 cups of sugar

Step-by-step explanation:

7/28= 5/x

x= 20.

x reps the number of cups of sugar

7 0
2 years ago
Which expression represents the measure of segment RS?
sasho [114]

Answer:

(4x+1)-(3x-4)=

4x-3x+1-4=

x-3

Step-by-step explanation:

6 0
3 years ago
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