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strojnjashka [21]
2 years ago
15

Jason has 4 gallons of hand sanitizer that contains 25% alcohol. He wants to make a hand sanitizer that contains 50% alcohol. Ho

w many gallons of pure alcohol should he add?
Mathematics
2 answers:
Reptile [31]2 years ago
5 0
4 gallons = 25% alcohol
He wants 50% alcohol, therefore, let’s double the amount.

8 gallons = 50% alcohol

Answer is 4 more gallons should be added to have 50% alcohol
Afina-wow [57]2 years ago
3 0

Answer:

Blah

Step-by-step explanation:

Blah Blah Blah

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The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass
Sauron [17]

Answer:

Quantity remaining= 27.5 grams

Step-by-step explanation:

If the initial quantity of the radioactive isotope= 220 grams

And for each half life it will reduce to half of its original quantity

For first half life

Quantity= 220/2

Quantity= 110 grams

Now for the second half life , the quantity to work with will be 110 grams

Second half life

Quantity= 110/2

Quantity= 55 grams

For the third half life , the quantity to work with is 55 grams

Third half life

Quantity= 55/2

Quantity= 27.5 grams

So after 3 half life's of this radioactive isotope, the amount remaining out of 220 = 27.5 grams.

Another simple way to do this

Since half life reduce the isotope by half of its original.

The third half life will reduce it by (1/2)^3= 1/8

So the quantity remaining= 1/8*220

Quantity remaining= 27.5 grams

6 0
2 years ago
I need help plz help
arsen [322]

Answer:

126

Step-by-step explanation:

To solve this, we need to use PEMDAS: Parentheses, exponents, multiplication, division, addition, subtraction

((4 x 8) + 10) x 3

Parentheses - multiplication

(32 + 10) x 3

Parentheses - addition

42 x 3

multiplication

126

3 0
2 years ago
What is the amplitude of g(x) = 10 cos (6x - 1) – 4?
aev [14]

Answer:

im notm sure sorry

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
I rlly need help with this gr 11 math problem
prohojiy [21]

Answer:

a) \frac{d-5.50}{0.45}

b) The inverse function is a reflection of the original function across the line

y = x. For example, if the function f applied to an input x gives a result of y, then applying its inverse function g to y gives the result x. So you would use it to find the x-value at a y just like you use the original to find the y value at an x.

Step-by-step explanation:

To do an inverse of a function you first switch the independent variable (d) and the dependent variable (c).

d = 0.45c + 5.50

Then you solve for c

d - 5.50 = 0.45 c

c = (d-5.50)/0.45

8 0
3 years ago
The flagpole is 20 ft high and casts an 8 foot shadow, the oak tree casts a 12 foot shadow. How tall is the oak tree
Fudgin [204]
Answer: 4.8 ft

To answer this question you need to know how much shadow: actual height ratio. Flagpole is having 8 ft shadow with 20 ft actual height. The ratio should be= 8 ft: 20 ft= 0.4

Then multiply the ratio with the oak tree shadow. The equation would be:
0.4 x 12 ft= 4.8 ft  
7 0
3 years ago
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