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Effectus [21]
4 years ago
10

I NEED HELP ASAP PLEASEEEE Evaluate the expression for m = –38. –23(m + 39) =

Mathematics
1 answer:
White raven [17]4 years ago
6 0

Answer: -23

Step-by-step explanation:

Since we are given the value of m, all we have to do is to plug m into the expression and solve.

-23(-38+39)                  [parenthesis]

-23(1)                            [multiply]

-23

Now, we know that the expression is -23 when m=-38.

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How many liter of 15% weed killer mixture must be added to 5 liters of 10% weedkiller mixture to make 12% weed killer mixture?
finlep [7]

Answer: 3 1/3 liter

Brainliest? <3

let x equal the number of liters of 15% weedkiller.

your equation is .15 * x + .10 * 5 = .12 * (x + 5)

simplify to get .15 * x + .10 * 5 = .12 * x + .12 * 5

simplify further to get .15 * x + .5 = .12 * x + .6

subtract .12 * x from both sides and subtract .5 from both sides and simplify to get .03 * x = .1

divide both sides by .03 to get x = .1 / .03 = 3.333333333 rounded to 9 decimal digits.

you would need 3.333333333 liters of 15% solution to be added to 5 liters of 10% solution to get 8.333333333 liters of 12% solution.

.15 * 3.333333333 = .5

.10 * 5 = .5

.5 + .5 = 1

5 + 3.333333333 = 8.333333333

1 divided by 8.333333333 = .12 which is equal to 12%.

4 0
3 years ago
What is x2 – 6 = 16x + 30 rewritten in standard form, then factored?
Molodets [167]
The answer to this is 
x= 18, -2
3 0
3 years ago
the area of a rectangle is 13 square inches. the length of the rectangle is 3.25 inches. what is the width of the rectangle? wha
IrinaK [193]

since the area of the rectangle is 13 square inches and the length is 3.25 inches subtract 3.25 from 13

13 - 3.25 = 9.75

which makes your width 9.75

to find the perimeter you add

9.75 + 3.25 + 9.75 + 3.25= 26.5

The perimeter of the rectangle is 26.5

4 0
3 years ago
An archeologist used the functions below to model the changing populations of two ancient cities as they grew in size. Compare t
Lyrx [107]

Answer:

The answer is "6.3 and 5.25"

Step-by-step explanation:

Please find the complete question in the attached file.

Throghout the question the calculated points are:

(0,0) , \ \ (40,252) \\(0,0) , \ \ (40,210) \\

Formula for Calculating slope:

M=\frac{y_2-y_1}{x_2-x_1}

For First point slope:

M=\frac{252-0}{40-0}=\frac{252}{40}= 6.3  \ \frac{people}{mi^2}

For second point slope: M=\frac{210-0}{40-0}=\frac{210}{40}=\frac{21}{4}= 5.25  \ \frac{people}{mi^2}

8 0
3 years ago
A zoo has 2 male lions. One sixth of the lions are male lions. How many lions are there at the zoo?
sattari [20]
12 because if 2 lions is one sixth than every 2 lions is one sixth and 2 times 6 is  twelve so there ya go
8 0
3 years ago
Read 2 more answers
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