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valkas [14]
2 years ago
13

How many gallons of a 90% antifreeze solution must be mixed with 90 gallons of 20% antifreeze to get a mixture that is 80% antif

reeze?
Mathematics
1 answer:
lozanna [386]2 years ago
7 0

Answer:

540

Step-by-step explanation:

Amount of antifreeze in the 90% solution + amount of antifreeze in the 20% solution = amount of antifreeze in the 80% solution

0.90 x + 0.20 (90) = 0.80 (x + 90)

0.90 x + 18 = 0.80 x + 72

0.10 x = 54

x = 540

You need 540 gallons of 90% antifreeze solution.

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Please help !!
shutvik [7]

Given:

The limit problem is:

\lim_{x\to 3}(x^2+8x-2)

To find:

The limit of the function by using direct substitution.

Solution:

We have,

\lim_{x\to 3}(x^2+8x-2)

Applying limit, we get

\lim_{x\to 3}(x^2+8x-2)=(3)^2+8(3)-2

\lim_{x\to 3}(x^2+8x-2)=9+24-2

\lim_{x\to 3}(x^2+8x-2)=33-2

\lim_{x\to 3}(x^2+8x-2)=31

Therefore, the correct option is D.

4 0
3 years ago
william is thinking of two numbers both numbers are square numbers greater than 1 the sum of numbers is 100 write down two numbe
zheka24 [161]

Answer:

Step-by-step explanation:

At first,

Let start writing the squares of number 0 to 10,

0²=0

1²=1

2²=4

3²=9

4²=16

5²=25

6²=36

7²=49

8²=64

9²=81

10²=100

Now,

According to your question,

  1. The two numbers should be square numbers
  2. They should be greater than 1.
  3. Their sum should be 100.

Hence, your given conditions matches with the numbers 64 and 36.

Therefore, the numbers are 64 and 36.

  • 64 and 36 are greater than 1.
  • 64 is a square of 8 and 36 is the square of 6.
  • 64+36=100
3 0
2 years ago
Work out the area of the circle take pi to be 3.142 the radius 11.2cm
lozanna [386]

The formula for the area of a circle is Area = PI x r^2

Area = 3.142 x 11.2^2

Area = 394.13 square cm.

6 0
2 years ago
Nicholas started a canned-food drive at school. The equation representing this is y = 235x + 15, where x is the number of days,
Olenka [21]

Answer:

well, 11 days

Step-by-step explanation:

if you were to put take out the y and put 2600 in the y place (2600=235x+15)

you solve that, and will come to 11 days

further explaining:

2600-15 = 2585

2585 / 235 = 11

( I'm not sure if this is right, the question is worded weird and almost doesn't make sense)

but I think it is looking for substitution

Hope this helps!

8 0
3 years ago
Read 2 more answers
What are the square roots of 144/256
adelina 88 [10]

Answer:

B

Step-by-step explanation:

12*12=144

-12*-12=144

16*16=256

-16*-16=256

3 0
3 years ago
Read 2 more answers
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