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zmey [24]
3 years ago
5

Cynthia can wallpaper a room in 4 hours and her brother can do it in 6 hours. How long would it take them if they work together

Mathematics
1 answer:
Debora [2.8K]3 years ago
3 0

Answer:

2 hours and 24 minutes

Step-by-step explanation:

cynthia can wallpaper a room 4 hours with means in 1 hour she can wallpaper 1/4th of the room, her brother can wallpaper the same room in 6 hours so I'm 1 hour he can wallpaper 1/6 of the room.

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PLEASE HELP! I need step by step!
sergeinik [125]

Answer:

C x +2y=8

Step-by-step explanation:

x+2y=8

x-x +2y = 8 -x

2y=8 -x

2y/2= 8/2 -x/2

y= 4 -1/2x

y= -1/2x =4 is the final answer

so it would be c

7 0
2 years ago
In how many ways can 7 people line if A needs to be first or last and B needs to be in the middle
12345 [234]

Answer:

<em>Assuming person A and person B are part of the 7 people</em>, there are 10 ways the 7 people can line up if A needs to be first or last and B needs to be in the middle.

Step-by-step explanation:

There are 2 places for A (first, last) and 5 places for B (anywhere but first or last). 2 x 5 = 10.

8 0
3 years ago
Sam has purchased a $30,000 car for his business. The car depreciates 30% every year. What is the explicit formula for this sequ
Step2247 [10]
If your just figuring out how much the car depreciated just by driving off the lot new...1st year.
$30,000×.30=$9,000

$30,000- $9,000=$21,000.

just take the brand new value of the car multiplied by the .30% of the 1st depreciation...take that answer ($9,000) and subtract it from your orginal value of $31,000.

which gives you $21,000

8 0
3 years ago
Read 2 more answers
If 30g of sugar is needed to make 4 cakes how much grams of sugar is needed to make 7 cakes
arsen [322]
There's two ways to do this.

The first way:
Work out the amount of sugar needed to make one cake, and then multiply that by 7.

30 grams ÷ 4 cakes = 7.5 grams for 1 cake.
7.5 grams × 7 cakes = 52.5 grams for 7 cakes.

The second way:
Work out the ratio of sugar:cake by doing 7 ÷ 4, and then multiplying that value by 30.

7 cakes ÷ 4 cakes = 1.75
1.75 × 30 grams = 52.5 grams for 7 cakes. 

Either way, the answer is 52.5 grams.
6 0
3 years ago
I need help on photo above please!!!
Leya [2.2K]
Option two is the correct answer
Hope this helps :)
4 0
3 years ago
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