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iogann1982 [59]
3 years ago
10

Can someone please help me

Mathematics
1 answer:
FromTheMoon [43]3 years ago
3 0
15. c. because 9+10+11+14=44, 44/4=11
16.
17.i because 24+30+21=75, 75/3=25.

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A man walks for x hours at a speed of
alexandr1967 [171]

Given:

A man walks for x hours at a speed of  (x + 1) km/h and cycles for (x - 1) hours at  a speed of (2x + 5) km/h.

Total distance  travelled is 90 km.

To find:

The value of x.

Solution:

We know that,

Speed=\dfrac{Distance}{Time}

Speed\times Time=Distance

A man walks for x hours at a speed of  (x + 1) km/h, so walking distance is

D_1=(x+1)(x) km

The man cycles for (x - 1) hours at  a speed of (2x + 5) km/h, so the cycling distance is

D_2=(2x+5)(x-1) km

Now,

Total distance = 90 km

D_1+D_2=90

(x+1)x+(2x+5)(x-1)=90

x^2+x+2x^2-2x+5x-5-90=0

3x^2+4x-95=0

3x^2+19x-15x-95=0

x(3x+19)-5(3x+19)=0

(3x+19)(x-5)=0

3x+19=0\text{ and }x-5=0

x=\dfrac{-19}{3}\text{ and }x=5

Time cannot be negative. So, the only possible value of x is 5.

3 0
2 years ago
<img src="https://tex.z-dn.net/?f=%20%7B4%7D%5E%7B3%7D%20" id="TexFormula1" title=" {4}^{3} " alt=" {4}^{3} " align="absmiddle"
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Answer:

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Step-by-step explanation:

6 0
3 years ago
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Please need help on this
Ronch [10]

Ray FM has terminal point F, so that will be the first letter of the name. The second letter of the name can be any of the points to the left of F on the line:

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3 years ago
What are common multiples of 7 and 4
Sergeu [11.5K]

Answer:

28, 56, 84, 112, etc.

Step-by-step explanation:

Since 28 is the first number they have in common, 28 is the least common multiple of 4 and 7.

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cluponka [151]
Soo what do you need help with? It seems pretty easy. I can help you if you want.
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2 years ago
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