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2 years ago

. A science class starts an experiment with

Mathematics

1 answer:

vesna_86 [32]2 years ago

3 0

Answer:

See below

Step-by-step explanation:

Plant A growth over 2 weeks:

23.5 cm - 2.5 cm = 21 cm

Average rate of change after 2 weeks or 14 days:

21/14 = 1.5 cm per day

If you need it in inches, then convert as below:

1.5 cm = 1.5 * 1/2.54 in = 1.5/2.54 in = 0.59 in per day (rounded0

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Pamela is 10 years older than Jiri. the sum of their ages is 76. what is jiri age

loris [4]

Answer:

jiri's age is 66 years old

Step-by-step explanation:

76-10= 66 years old

4 0

3 years ago

Flying against the wind, an airplane travels 3060 kilometers in 3 hours. Flying with the wind, the same plane travels 7560 kilom

cluponka [151]

Answer:

The speed of plane against wind S 1 = 1020 kmph And

The speed of plane with wind S 2 = 1260 kmph

Step-by-step explanation:

Given as :

The distance of airplane against the wind = D 1 = 3060 km

The time taken in against the wind = T 1 = 3 hours

The distance of airplane with the wind = D 2 = 7560 km

The time taken in with the wind = T 2 = 6 hours

Now, Speed of plane against the wind = $\frac{Distance}{Time}$

So, S 1 = $\frac{D 1}{T 1}$

Or, S 1 = $\frac{3060}{3}$ = 1020 kmph

Similarly

Speed of plane with the wind = $\frac{Distance}{Time}$

Or, S 2 = $\frac{D 2}{T 2}$

Or, S 2 = $\frac{7560}{6}$ = 1260 kmph

Hence The speed of plane against wind S 1 = 1020 kmph And

The speed of plane with wind S 2 = 1260 kmph Answer

8 0

4 years ago

Please help for 18 n 19

Hitman42 [59]

$18. \ \ \frac{-1}{x-9}- \frac{-2}{x+7}= \frac{-1(x+7)+2(x-9)}{(x-9)(x+7)}= \frac{-x-7+2x-18}{(x-9)(x+7)}= \frac{x-25}{(x-9)(x+7)}$

$\frac{2}{x}+ \frac{12}{x}=7 \\ \\ \frac{14}{x} =7 \\ \\ x= \frac{14}{7} \\ \\ x=2$

7 0

3 years ago

Your school wants to have 5 computers for every 12 students. There are now 125 computers and 924 students. How many more compute

skad [1K]

You can first set up a ratio to see how many TOTAL computers are needed for a r to 12 ratio.
(5/12) = (x/924) Now cross multiply to solve. 12x = 5(924) 12x = 4620
Divide both sides by 12. x = 385
There are a total of 385 computers needed for the school to have a 5:12 ratio.
Since the school already has 125 computers subtract 385-125 = 260. They need to purchase 260 more computers.

7 0

3 years ago

Read 2 more answers

What is the unit ratio for a button of 16 grams and 2 milliliters?

Reika [66]

Answer:

The unit ratio would be 8 grams per milliliters

Step-by-step explanation:

Since, the unit ratio is a fraction with denominator 1,

In other words, the amount of one quantity in unit amount of other quantity is called unit rate or unit ratio.

Here, the amount first quantity = 16 grams,

The amount of second quantity = 2 milliliters,