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3 years ago

Write the proportion 5.5 hours is to 4.5hrs as 7.5 hours in to 60hours

1 answer:

4 0

So the proportion would go as follows

5.5. 7.5
=
4.5. 60

To solve this you just cross muliply and divide.
I hope this helps you

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Suppose we want to build a rectangular storage container with open top whose volume is $$12 cubic meters. Assume that the cost o

Snezhnost [94]

Answer:265.25

Step-by-step explanation:

Given

Volume of box $=12 m^3$

height is 3 times the width

let height, length and breadth be H, L & B

$H=3\times B$

$V=12=L\times B\times H$

4=B^2\times L[/tex]

$L=\frac{4}{B^2}$

Cost of side walls $ $8/m^2$

Cost of base $ $12/m^2$

Cost of side walls $=(2LH+2BH)\cdot 8$

Cost of base $=12LB$

Total cost $C=16LH+16BH+12LB$

$C=48LB+48B^2+12LB$

$C=\frac{192}{B}+48B^2+\frac{48}{B}$

differentiate C w.r.t B to get minimum cost

$\frac{\mathrm{d} C}{\mathrm{d} B}=-\frac{192}{B^2}+2\times 48 B-\frac{48}{B^2}$

$B^3=\frac{240}{2\times 48}$

$B=1.35 m$

$H=3\times 1.35=4.07 m$

L=2.19 m

C=$ 265.25

3 0

3 years ago

There are fewer than 30 students in the A-level mathematics class. One half of them

masya89 [10]

The number of students that play hockey is 7

The proportion is given as:

$Piano =\frac 12$

$Hockey =\frac 14$

$School\ Play =\frac 17$

The total number of students must be a multiple of 2, 4 and 7 less than 30;

The only multiple of 2, 4 and 7 less than 30 is 28.

The number of students that play hockey is the product of 28 and the proportion that plays hockey.

So, we have:

$Hockey =\frac 14 \times 28\\$

Multiply

$Hockey =7$

Hence, 7 students play hockey

Read more about common multiples at:

brainly.com/question/290451

7 0

3 years ago

Given the sides of the four triangles below, which is NOT a scalene triangle?

posledela

Answer:

under the circustances of this trajectory the triangular polverinization oxiding cells are answer choice A thus that answer is not a scalene triangle

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Answer this please correctly for brainliest

Anastaziya [24]

Answer:

The first one

Step-by-step explanation:

Because you mulitply 4 by 5 to get 20

7 0

3 years ago

Read 2 more answers

Fill out the missing values in the table

geniusboy [140]

Step-by-step explanation:

1 = 18

5 = 18 x 4

0.5 = 0.092

3.5 = 0.06

8 0

3 years ago