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never [62]
3 years ago
6

0.2(x + 15) = 0.5(3x - 7)

Mathematics
1 answer:
Dafna1 [17]3 years ago
8 0
Are you asking if this is greater than, less than, or equal to?
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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
Solve 2x^2=11x+6 by factoring
Ede4ka [16]

Answer:

(x-6) (2x+1)

Step-by-step explanation:

1) move everything over to the left side, so subtract 11x and 6.

2x^2 -11x - 6 = 0

2)multiply 2(a term) with -6 (c term)

x^2 -11x -12

3) factor and find what multiples to -12 and adds up to -11. in this case its -12 and positive 1

(x-12) (x+1)

4) divide -12 and 1 by the original a term (2)

(x-6) (x+1/2)

5) move the denominator of 2 over to the x.

(x-6) (2x+1)

5 0
3 years ago
Factor the expression.<br> 30-4n
zheka24 [161]
Hope this is what you are looking for the answer is 2(15-2n)
7 0
3 years ago
Read 2 more answers
A booth at an amusement park sells sandwiches and a variety of sides. Each
rodikova [14]

Answer: 3

Explanation: 7.50 - 5.25= 2.25 ÷ .75= 3

7 0
3 years ago
I really need help with this question I’m taking a test it’s urgent !!
dimaraw [331]

Answer:

EF = 10

Step-by-step explanation:

QUICK

9/15 = 6/x

x=10

8 0
3 years ago
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