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maw [93]
3 years ago
11

Machine A can sort 840 pieces of mail per hour, and Machine B can sort 760 pieces per hour. How long will it take both machines

running at the same time to sort 12,800 pieces of mail?
A) 4 hours
B) 6 hours
C) 7 hours
D) 8 hours
Mathematics
2 answers:
julia-pushkina [17]3 years ago
6 0

Answer:

D

Step-by-step explanation:

for 8hours A=6720

for 8hours B=6080

Therefore total is 6720+6080=12800

marin [14]3 years ago
5 0

Answer: D) 8 hours

Step-by-step explanation:

Machine A: 840 an hour

Machine B: 760 an hour

h = hour

840 + 760 = 1600

In an hour, they can both sort 1600 mails.

1600h = 12800

Divide each side by 1600

h = 8

840 * 8 = 6720

760 * 8 = 6080

6720 + 6080 = 12,800

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X2 – 7x + 6 = -8<br> solve using factoring
murzikaleks [220]

Answer:

Step-by-step explanation:

Rewrite this in standard quadratic equation form:  x^2 - 7x +  6 + 8 = 0, or x^2 - 7x + 14 = 0.  This does not factor easily, so I will use the quadratic formula to find the roots and then write out the factors based upon the roots:

The discriminant is b^2 - 4ac, which here is (-7)^2 - 4(1)(14) = -7.

Because the discriminant is negative, we know that there are two unequal, complex roots.  They are:

      -(-7) ± i√7         7 ± i√7

x = ----------------- = ---------------

              2                     2

One factor is (x - [1/2]{7 ± √7}  )

7 0
2 years ago
Which is true about the completely simplified difference of the polynomials 6x6 − x3y4 − 5xy5 and 4x5y + 2x3y4 + 5xy5?
Galina-37 [17]
<span>Let be A= 6x6 − x3y4 − 5xy5 and B= 4x5y + 2x3y4 + 5xy5 and when we do their difference, it is A - B = 6x6 − x3y4 − 5xy5 -( 4x5y + 2x3y4 + 5xy5)=6x6 − x3y4 − 5xy5 - 4x5y - 2x3y4 - 5xy5 = 6x6 - x3y4 - 2x3y4 - 5xy5 -4xy5 -5xy5=6x6 - 3x3y4 -14xy5, so the final solution is A - B =6x6 - 3x3y4 -14xy5, the degree of this is equal to the degree of - 3x3y4, and it is 3+4=7, the answer is The difference has 3 terms and a degree of 7.</span>
8 0
2 years ago
Read 2 more answers
Maria finishes ¾ of the race in 6 hours. How long was the entire race?
GuDViN [60]

Answer:

We are asked to find the duration of entire race. As Rachel finished of the race in 6 hours, so of x will be equal to 6. Therefore, the duration of entire race was 8 hours.

( i looked this up but that is the answer i dont take any credit for this answer)  

6 0
3 years ago
I need help asap!!!!!!!!!!!!!
Tatiana [17]

Answer:

Step-by-step explanation:

7 0
3 years ago
1: 1/2 km equals to how many metres?
VMariaS [17]
1.
km=kilometers
kilo=1000
1 km=1000meters
so
1/2km= 1/2 times 1000=1000/2=500meters


2. 1/4 km=1000/4=250 meters

3. 1/5 km=1000/5=200 meters

4. 2/5 km=2000/5=400 meters

5. 3/4 km=3000/4=750 meters

6. 1/8 km=1000/8=125 meters
7 0
2 years ago
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