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3 years ago

Solve the Following expression d=5 2d+4d-9-7=

Mathematics

3 answers:

makkiz [27]3 years ago

7 0

Answer:

Step-by-step explanation:

d=5 so

2(5)+4(5)-9-7

10+20-9-7

30-9-7

21-7

inessss [21]3 years ago

7 0

Answer:

2×5+4×5-9-7.

10+20-9-7.

=14.

rewona [7]3 years ago

7 0

Answer:

2×5+4×5-9-7.

10+20-9-7.

=14.

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Devon made a box with length x+1, width x+3, and height x-3. What is the volume of Devon's box as a function of x?

erica [24]

Answer:

(a)

$V=x^3+x^2-9x-9$

(b)

$x=10$

(c)

$x=\frac{7}{2}$

Step-by-step explanation:

we are given

length is x+1

$L=x+1$

width is x+3

$W=x+3$

height is x-3

$H=x-3$

(a)

we can use volume formula

$V=L\times W\times H$

now, we can plug it

$V=(x+1)\times (x+3)\times (x-3)$

now, we can simplify it

$V=x^3+x^2-9x-9$

(b)

we are given volume =1001

so, we can set V=1001

and then we can solve for x

$V=x^3+x^2-9x-9=1001$

now, we can factor it

$\left(x-10\right)\left(x^2+11x+101\right)=0$

$x-10=0$

$x=10$

(b)

we are given volume

so, we can set

$V=14\frac{5}{8}=\frac{14\times 8+5}{8}$

$V=\frac{117}{8}$

and then we can solve for x

$V=x^3+x^2-9x-9=\frac{117}{8}$

now, we can factor it

$8x^3+8x^2-72x-189=0$

$\left(2x-7\right)\left(4x^2+18x+27\right)=0$

$2x-7=0$

$x=\frac{7}{2}$

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3 years ago

At the school football game, there are 42 adults

galina1969 [7]

Answer:

54 students

Step-by-step explanation:

42 / 7 = 6

9 x 6 = 54

42 : 54 = 7 : 9

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Answer:

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Step-by-step explanation:

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umka21 [38]

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