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insens350 [35]
3 years ago
9

I need the answer to this question

Mathematics
1 answer:
bija089 [108]3 years ago
7 0
If you divide the original equation by "a", you have your answer.
  30/a = (a*60)/a = 60*(a/a)
  30/a = 60
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5 times the sum of a number and 4 equals 9
goblinko [34]

Answer:

-2.2

Step-by-step explanation:

By using the equation 5*(4+x)=9, when you isolate x you get -2.2.

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THE DIMENSIONS OF A CUBED ARE 4X C.M,6X C.M AND 10X C.M
scZoUnD [109]

Answer:

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raketka [301]

Answer:38x-34

Step-by-step explanation:

f(x)=x^2+3x-7

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We multiply the entire F equation times two, (x^2+3x-7)*4=

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3 years ago
A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed
musickatia [10]

Try this solution:

Answer: 6 & 4.5 (m-per-h)

Step-by-step explanation:

- The basic formula used in this task is S=V*t, where S - distance, V - speed, t - time.

- the downstream speed is: V+Vc, where V - the speed of the boat in still water, Vc - the speed of the current.

- the upstream speed is: V-Vc.

- according to the described above the distance for downstream is S1=(V+Vc)*t1, where t1=10; the distance for upstream is S2=(V-Vc)*t2, where t2=70.

- for whole travel down- and upstream: S=S1+S2.

- Using these it is possible to make up the system of the equations:

\left \{ {{(70(V-V_c)=10(V+V_c)} \atop {70(V-V_c)+10(V+V_c)=210}} \right.

V - the speed of the boat in still water - 6 miles per hour, Vc - the speed of the current - 4.5 miles per hour. All the details for the system of the equations are in the attachment.

4 0
3 years ago
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