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stiv31 [10]
3 years ago
7

Evaluate these please [-4+9] [-4]+9

Mathematics
1 answer:
Andrews [41]3 years ago
6 0

Answer:

-11

Step-by-step explanation:

Simplify

5×−4+9

Simplify

−20+9

Answer

−11

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if they work together, then 1/700 + 1/600 of the total work can be done per hour.

to add these 2 fractions we need to bring them to the same denominator. and that would be 4200 (LCM of 700 and 600).

1/700 + 1/600 = 6/4200 + 7/4200 = 13/4200

so, together, they can do 13/4200 if the total job in 1 hour.

how many hours will they need together to finish the job ?

well, how often does 13 fit into 4200 (as 4200/4200 is the complete job) ?

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so, it will still take a little bit over 323 hours to clean all the streets.

but there are only 168 hours until the film crew starts.

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2 years ago
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