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rodikova [14]
3 years ago
8

8th grade math PLEASE HELPPPP

Mathematics
2 answers:
Tasya [4]3 years ago
7 0

Answer:

the constant proportionality is 2.5

andrezito [222]3 years ago
4 0
I’m pretty sure the answer is 2.5
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It is A

Step-by-step explanation:

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How many cubic feet of water can a 18 inch by 19 inch by 36 inch aquarium hold?
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Volume = Length x Width x Height 

Volume = 18 x 19 x 36 = 12312 in³

Answer:  12312 in³
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A meter stick perpendicular to the ground casts a 1.5 meter shadow at the same time a telephone pole casts a shadow that is 9 me
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7 0
3 years ago
A hiker starting at point P on a straight road wants to reach a forest cabin that is 2 km from a point Q, 3 km down the road fro
pantera1 [17]

Answer:

2.19 km

Step-by-step explanation:

If x is the distance she walks down the road before turning, then the total time is:

t = x/8 + √((3 − x)² + 2²) / 3

t = x/8 + √(9 − 6x + x² + 4) / 3

24t = 3x + 8√(13 − 6x + x²)

24t = 3x + 8(13 − 6x + x²)^½

Take derivative of both sides with respect to x.

24 dt/dx = 3 + 4(13 − 6x + x²)^-½ (-6 + 2x)

When t is a minimum, dt/dx = 0.

0 = 3 + 4(13 − 6x + x²)^-½ (-6 + 2x)

-3 = 4(13 − 6x + x²)^-½ (-6 + 2x)

3 / (6 − 2x) = 4(13 − 6x + x²)^-½

3 / (24 − 8x) = (13 − 6x + x²)^-½

(24 − 8x) / 3 = (13 − 6x + x²)^½

(24 − 8x)² / 9 = 13 − 6x + x²

576 − 384x + 64x² = 117 − 54x + 9x²

459 − 330x + 55x² = 0

Solve with quadratic formula.

x = [ 330 ± √((-330)² − 4(55)(459)) ] / 2(55)

x = (330 ± √7920) / 110

x = 2.19 or 3.81

Since 0 < x < 3, x = 2.19.

7 0
3 years ago
Please help meeee:(((( give explanation
choli [55]

Answer:

5 ( x – 3) = – 3 (2x+5)

5x – 15 = – 6x – 15

5x +6x = – 15 +15

11 x = 0

x =0/11

x =0

I hope I helped you^_^

8 0
2 years ago
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