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2 years ago

Plz do this all plz

Mathematics

1 answer:

Taya2010 [7]2 years ago

6 0

Answer:

I don't know search it up I picked B

okay it's 5 and I'm

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B) 5(2x - 4)<br> Expand the following

jeka94

Answer:

10x-20

Step-by-step explanation:

(5×2x)-(5×4)

10x-20

8 0

2 years ago

What are the odds against choosing a red marble from a bag that contains two blue marbles, one green marble, seven white marbles

Alina [70]

Answer:

4/14

Step-by-step explanation:

2+1+7+4=14

red marbles are 4/14

7 0

2 years ago

Read 2 more answers

The bill for dinner was $34. You left $50 to pay for the meal and tip the server. What percent of the meal did you leave as a ti

9966 [12]

Answer:

Step-by-step explanation:

$50 - 34 = 16$

6 0

2 years ago

A rectangular box is to have a square base and a volume of 12 ft3. If the material for the base costs $0.17/ft2, the material fo

katen-ka-za [31]

Answer:

(a)Length =2 feet

(b)Width =2 feet

(c)Height=3 feet

Step-by-step explanation:

Let the dimensions of the box be x, y and z

The rectangular box has a square base.

Therefore, Volume of the box $V=x^2z$

Volume of the box $=12 ft^3\\$

$Therefore, x^2z=12\\z=\frac{12}{x^2}$

The material for the base costs $\$0.17/ft^2$ , the material for the sides costs $\$0.10/ft^2$ , and the material for the top costs $\$0.13/ft^2$ .

Area of the base $=x^2$

Cost of the Base $=\$0.17x^2$

Area of the sides $=4xz$

Cost of the sides= $=\$0.10(4xz)$

Area of the Top $=x^2$

Cost of the Base $=\$0.13x^2$

Total Cost, $C(x,z) =0.17x^2+0.13x^2+0.10(4xz)$

Substituting $z=\frac{12}{x^2}$

$C(x) =0.17x^2+0.13x^2+0.10(4x)(\frac{12}{x^2})\\C(x)=0.3x^2+\frac{4.8}{x} \\C(x)=\dfrac{0.3x^3+4.8}{x}$

To minimize C(x), we solve for the derivative and obtain its critical point

$C'(x)=\dfrac{0.6x^3-4.8}{x^2}\\Setting \:C'(x)=0\\0.6x^3-4.8=0\\0.6x^3=4.8\\x^3=4.8\div 0.6\\x^3=8\\x=\sqrt[3]{8}=2$

Recall: $z=\frac{12}{x^2}=\frac{12}{2^2}=3\\$

Therefore, the dimensions that minimizes the cost of the box are:

(a)Length =2 feet

(b)Width =2 feet

(c)Height=3 feet

7 0

2 years ago

If 1 inch represents 36 Miles on a map, how many miles does 4 1/4 inches represent?

strojnjashka [21]

Answer:

153 miles

Step-by-step explanation:

36 * 4.25 = 153

3 0

2 years ago

Read 2 more answers

Plz do this all plz ​

Plz do this all plz