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skelet666 [1.2K]
3 years ago
6

ITS DUE IN 20 MINUTES HELP PLEASE

Mathematics
1 answer:
umka21 [38]3 years ago
7 0

Answer:

1. 142in^2

2. 190cm^2

3. 1,236cm^2

4. 3,380 ft^3

5. Possible answer: I would find the total

surface area of each cube and then

subtract the area of the sides that are not

painted, including the square underneath

the small cube.

6. 384in^2

Helpful?! brainliest!!

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An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airp
balu736 [363]

Answer:

r  = 225 Mil/h     speed of the airplane in still air

Step-by-step explanation:

Then:

d  is traveled distance   and r  the speed of the airplane in still air

so the first equation is for a 4 hours trip

as  d = v*t

d  =  4 *  ( r  + 25)    (1)          the speed of tail wind  (25 mil/h)

Second equation the trip back in 5 hours

d  =  5  * ( r  - 25 )    (2)

So we got a system of two equation and two unknown variables  d  and

r

We solve it by subtitution

from equation (1)     d  =  4r  + 100

plugging in equation 2

4r  + 100  = 5r -  125    ⇒   -r  =  -225     ⇒    r  = 225 Mil/h

And distance is :

d  =  4*r  +  100         ⇒ d  =  4 * ( 225)  +  100

d  =  900 +   100

d  = 1000 miles

6 0
4 years ago
Rachel's learning to play the violin Monday through Friday she practices 45 minutes on each day on Saturday and Sundays he broug
I am Lyosha [343]

Rachel spends 6 hours 45 minutes a week trying to learn to play the violin.

Step-by-step explanation:

Step 1; Rachel learns for 45 minutes a day from Monday through Friday and in the weekend she learns to play the violin for one and a half hours. So she learns for the following periods of time

Monday - 45 minutes

Tuesday - 45 minutes

Wednesday - 45 minutes

Thursday - 45 minutes

Friday - 45 minutes

Saturday - 90 minutes (60 × 1.5 hours)

Sunday - 90 minutes (60 × 1.5 hours)

Step 2; To determine how much time she practices in a week we just add the individual times she plays on each day.

Total time practices in a week = 45 + 45 + 45 + 45 + 45 + 90 + 90 = 405 minutes = 6 hours 45 minutes.

           

5 0
3 years ago
Water flows through a pipe at a rate of 490 milliliters every 6.5 hours. Express this rate of flow in fluid ounces per minute.
sergij07 [2.7K]

Answer:

0.42

Step-by-step explanation:

8 0
4 years ago
What is the range of the function?
Tanya [424]

Answer: Option D

Step-by-step explanation:

The y-axis of the table represents the range of the function.

3 0
3 years ago
100^m ÷ 1000^n can be written in the form 10^z. Express z in terms of m and n
Kitty [74]

100m ÷ 1000n

(102)m ÷ (103)n

102m ÷ 103m

10-m

4 0
4 years ago
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