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3 years ago

12

Amy is growing basil. On February 1st her plant was 5 inches high. A week later, the plant’s height became 9 inches high. By wha

t percent did the plant grow?

2 answers:

Ronch [10]3 years ago

6 0

It is 80%
It is correct

vladimir1956 [14]3 years ago

4 0

(9-5/5)*100= (4/5)*100 = 80% ( new height- original height /original height ) *100 the plant grew 80%

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Robert's father is 4 years older than 3 times Robert's age. His father is 40 years old. Write the equation used to determine Rob

FrozenT [24]

Answer:

robert is 12 years old

Step-by-step explanation:

robert's age=x

40=3x+4

that's the equation

40=3x+4

=36=3x

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3 years ago

Barbara drives between Miami, Florida, and West Palm Beach, Florida. She drives 50 mi in clear weather and then encounters a thu

cluponka [151]

Answer:

<em>Her speed driving in nice weather is 50 mph and in thunderstorm is 32 mph.</em>

Step-by-step explanation:

Barbara drives 50 miles in clear weather and then encounters a thunderstorm for the last 16 miles.

Suppose, her speed in nice weather is $x$ mph.

As she drives 18 mph slower through the thunderstorm than she does in clear weather, so her speed in thunderstorm will be: $(x-18) mph$

<u>We know that,</u> $Time = \frac{Distance}{Speed}$

So, <u>the time of driving in clear weather</u> $=\frac{50}{x}$ hours

and <u>the time of driving in thunderstorm</u> $=\frac{16}{x-18}$ hours.

Given that, <u>the total time for the trip is 1.5 hours</u>. So, the equation will be......

$\frac{50}{x}+ \frac{16}{x-18}=1.5 \\ \\ \frac{50x-900+16x}{x(x-18)}=1.5\\ \\ \frac{66x-900}{x(x-18)}=1.5 \\ \\ 1.5x(x-18)=66x-900\\ \\ 1.5x^2-27x=66x-900\\ \\ 1.5x^2-93x+900=0\\ \\ 1.5(x^2 -62x+600)=0\\ \\ x^2 -62x+600=0\\ \\ (x-50)(x-12)=0$

Using zero-product property.........

$x-50=0\\ x=50\\ \\ and\\ \\ x-12=0\\ x=12$

<em>We need to ignore $x=12$ here, otherwise the speed in thunderstorm will become negative.</em>

So, her speed driving in nice weather is 50 mph and her speed driving in thunderstorm is (50-18) = 32 mph

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3 years ago

9 x 5<br> -<br> 9 im give brainlists

Alenkinab [10]

Answer:

9 x 5 - 9 = 36

Step-by-step explanation:

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2 years ago

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Yuliya22 [10]

Answer:

Jen used a card to make the purchase, and she received a bill within 15 days of the purchase. She paid $21.30 for the next 18 months until the bill was paid in full. The full payment included $58.60 in interest.

Step-by-step explanation:

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3 years ago

1/5x+y=2/5<br> 1/0x+1/3y=1/2

kkurt [141]

A)
<span>|x + y = 5 </span>
<span>|2x - y = 7; </span>
<span>b) </span>
<span>|2x + y = 5 </span>
<span>|x - y = 2 </span>
<span>c) </span>
<span>|3x + y = 6 </span>
<span>|4x - 3y = -5 </span>
<span>d) </span>
<span>|1/(x - 1) = y - 3 </span>
<span>|x - y = -2 </span>
<span>e) </span>
<span>|(9x + 4y)/3 - (5x - 11)/2 = 13 - y </span>
<span>|13x - 7y = -8 </span>
<span>Answer: </span>c<span> and </span>e<span> has solution (1; 3)</span>

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3 years ago

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