3 years ago

Need help please it’s due today show work

Mathematics

1 answer:

Diano4ka-milaya [45]3 years ago

6 0

Answer:

Step-by-step explanation:

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the answer is 12

Step-by-step explanation:

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True or false The opposite of a number is always positive

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False because if the number was positive the opposite of that would be negative

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DochEvi [55]

D. (xy2 + 3z14)(x2y4 – 3xy2z14 + 9z28

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3 years ago

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Train a is traveling at 30 mph faster than train b. If train a travels 350 miles in the same amount of time that train b travels

GalinKa [24]

Answer:

20 mph

Step-by-step explanation:

Let speed of Train a = Va mph

Let speed of Train b = Vb mph

Va = Vb + 30

Let time taken for Train a = Ta

Let time taken for Train b = Tb

time taken = distance travelled/speed

Ta = 350/Va = 350/(Vb+30)

Tb = 140/Vb

But they both travel in the same amount of time.

So, Ta = Tb

$\frac{350}{v_{b} + 30}=\frac{140}{v_{b}}$

Cross multiply

$350v_{b} = 140(v_{b} + 30)\\\\350v_{b} = 140v_{b} + 4200\\\\350v_{b} -140v_{b} = 4200\\\\210v_{b} = 4200$

Divide both sides by 210

$\frac{210v_{b} }{210} \frac{4200}{210} \\\\v_{b} = 20 mph$

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2 years ago

If I can run 231 miles in 10.5 hours, how far can I run in 1 hour? (Se

Gemiola [76]

Whenever you have the answers for TOTAL MILES RUN and HOW MANY HOURS RUN (which you do), just divide the total miles by the amount of hours!

So, do 231 / 10.5

This is equal to 22!

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3 years ago