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Vedmedyk [2.9K]
2 years ago
11

Multiply -3x(4x - 5)

Mathematics
2 answers:
Burka [1]2 years ago
5 0
Hopes this helps if right please mark as brainlist:

Answer: -12x^2 + 15x
Elena-2011 [213]2 years ago
4 0

Answer:

-12x^2+15x

Step-by-step explanation:

-3x(4x-5)

Distributive property:

-3x*4x-(-3x)*5

-3*4x^2+3*5x

Simplify:

-12x^2+15x

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Find the dimensions of the rectangle with area 256 square inches that has minimum perimeter, and then find the minimum perimeter
mezya [45]

Answer:

Dimensions: A=a\cdot b=256

Perimiter: P=2a+2b

Minimum perimeter: [16,16]

Step-by-step explanation:

This is a problem of optimization with constraints.

We can define the rectangle with two sides of size "a" and two sides of size "b".

The area of the rectangle can be defined then as:

A=a\cdot b=256

This is the constraint.

To simplify and as we have only one constraint and two variables, we can express a in function of b as:

b=\frac{256}{a}

The function we want to optimize is the diameter.

We can express the diameter as:

P=2a+2b=2a+2*\frac{256}{a}

To optimize we can derive the function and equal to zero.

dP/da=2+2\cdot (-1)\cdot\frac{256}{a^2}=0\\\\\frac{512}{a^2}=2\\\\a=\sqrt{512/2}= \sqrt {256} =16\\\\b=256/a=256/16=16

The minimum perimiter happens when both sides are of size 16 (a square).

4 0
3 years ago
The amount of money in a saving account increase from $250 to $270 what is the precent increase of the money in the savings acco
saveliy_v [14]

Answer:

8%

Step-by-step explanation:

percent increase = [ (difference between initial value and final value) ÷ initial value] x 100

⇒ percent increase = [ (270 - 250) ÷ 250] x 100 = 8%

7 0
2 years ago
Read 2 more answers
Solve the algebraic expression below (2/5) (10) + 8
Andrews [41]

Answer: 12.

Step-by-step explanation:

4 0
2 years ago
Please help me i really need help ok i need real answer
krek1111 [17]

Answer:

The last answer choice.

Step-by-step explanation:

8/10 is equal to 0.80, so that's the answer! Hope it helps!

5 0
2 years ago
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A researcher asks 4 people if they like to watch thriller movies, and 3 people say they do. Explain why the following statement
serg [7]
This sample size it too small.  The larger the sample size, the more likely the data will be true to what the question is asking.  A larger sample size brings more precision to the question that is being asked.
5 0
3 years ago
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