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Whitepunk [10]
2 years ago
6

Cho hai mệnh đề p, q như sau:

Mathematics
1 answer:
Ivahew [28]2 years ago
5 0

Answer:

Step-by-step explanation:

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HELP ME PLS!!!!
Marina CMI [18]

Answer:

10°

Step-by-step explanation:

360/36 = 10

3 0
3 years ago
A road is
Airida [17]

9514 1404 393

Answer:

  25/42 mi

Step-by-step explanation:

5/6 of 5/7 of a mile is ...

  (5/6)(5/7 mi) = 25/42 mi

4 0
3 years ago
A deposit of 1600 at 6% for 180 days A.)17.28 B.)47.34 C.) 48.00 D.) 17,280.00​
VMariaS [17]

Answer:

the answqee is D.

Step-by-step explanation:

8 0
3 years ago
A rectangular box with a square base is to be constructed from material that costs $9 per ft2 for the bottom, $5 per ft2 for the
kramer

Answer:

18.73ft^3

Step-by-step explanation:

Let

Side of square base=x

Height of rectangular box=y

Area of square base=Area of top=(side)^2=x^2

Area of one side face=l\times b=xy

Cost of bottom=$9 per square ft

Cost of top=$5 square ft

Cost of sides=$4 per square ft

Total cost=$204

Volume of rectangular box=V=lbh=x^2y

Total cost=9(x^2)+5x^2+4(4xy)=14x^2+16xy

204=14x^2+16xy

204-14x^2=16xy

y=\frac{204-14x^2}{16x}=\frac{102-7x^2}{8x}

Substitute the values of y

V(x)=x^2\times \frac{102-7x^2}{8x}=\frac{1}{8}(102x-7x^3)

Differentiate w.r.t x

V'(x)=\frac{1}{8}(102-21x^2)=0

V'(x)=0

\frac{1}{8}(102-21x^2)=0

102-21x^2=0

102=21x^2

x^2=\frac{102}{21}=4.85

x=\sqrt{4.85}=2.2

It takes positive because side length cannot be negative.

Again differentiate w.r. t x

V''(x)=\frac{1}{8}(-42x)

Substitute the value

V''(2.2)=-\frac{42}{8}(2.2)=-11.55

Hence, the volume of box is maximum at x=2.2 ft

Substitute the value  of x

y=\frac{102-7(2.2)^2}{8(2.2)}=3.87 ft

Greatest volume of box=x^2y=(2.2)^2\times 3.87=18.73 ft^3

5 0
3 years ago
Merry christmas! my teachers gave me work. ill be happy if u help
Sauron [17]
Heyy merry christmas !
area of a triangle = base * height : 2
4 * 5 = 20 : 2 = 10
10 * 12triangles = 120cm^3
4 0
2 years ago
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