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Ahat [919]
3 years ago
14

Help me its an algebra 2 question 2. John can mow his lawn in 3 hours and his sister, Julie, can mow it in 2 hours. How long wil

l it take them to mow their lawn if they work together?
A. 1 hour 12 minutes
B. 1 hour 15 minutes
C. 1 hour 20 minutes
D. 1 hour 30 minutes
E. 1 hour 35 minutes
Mathematics
1 answer:
Travka [436]3 years ago
7 0

Answer:

A

Step-by-step explanation:

John can mow the same lawn in 3 hours.

In 1 hour he can mow 1/3rd of the lawn.

In 1 hour they can together mow (1/2+1/3)=5/6th of the lawn.

Together they can mow the lawn in 6/5 hours=1.2 hours.

I hope this helped, please mark Brainliest, thank you!!

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What is the cost of an $8,000 car including 5½% tax?
mina [271]

Answer:

$8,440

Step-by-step explanation:

5.5% of 8,00 = 440

8,000 + 440 = 8,440

6 0
3 years ago
20. Crystal gets paid $250 a
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Answer:

50c+250=t

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Step-by-step explanation:

Since this is weekly income, 250 does not need a variable.

then the rest falls into place

i hope this helps u

pls give a brainliest and a thx

4 0
3 years ago
Please help and I will mark you as brainliest!
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Determine the factors of x^2 − 12x − 20. (5 points)
Vikki [24]

For this case we must factor the following expression:x ^ 2-12x-20

We have that the expression cannot be factored with rational numbers.

On the other hand, we can find the zeros, applying the quadratic formula we have:x = \frac {-b \pm \sqrt {b ^ 2-4 (a) (c)}} {2 (a)}

Where:

a = 1\\b = -12\\c = -20

x = \frac {- (- 12) \pm \sqrt {(- 12) ^ 2-4 (1) (- 20)}} {2 (1)}\\x = \frac {12 \pm \sqrt {144-4 (1) (- 20)}} {2 (1)}\\x = \frac {12 \pm \sqrt {144 + 80}} {2}\\x = \frac {12 \pm \sqrt {224}} {2}\\x = \frac {12 \pm \sqrt {16 * 14}} {2}\\x = \frac {12 \pm4 \sqrt {14}} {2}

Thus, the roots would be:

x_ {1} = 6 + 2 \sqrt {14}\\x_ {2} = 6-2 \sqrt {14}

Answer:

the expression cannot be factored with rational numbers.

3 0
3 years ago
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