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Deffense [45]
3 years ago
8

Can someone help me with number 18

Mathematics
1 answer:
frosja888 [35]3 years ago
6 0
You should buy the 0.8 kilogram block of wax because 1000 grams is equal to a kilogram and 1000 milligrams is equal to a gram. If you add all of these up, you will get less than 0.8 kilograms so it will be useless to get way more when you don’t need it.
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Michelle collects US, Canadian and Mexican stamps. In her collection 80% of the stamps are U.S. and Mexican stamps. there are 3
vlada-n [284]
We know that 80% of the stamps are US and Mexican. 
The US stamps are 3 times the Mexican stamps. That means that of the 80%, Mexicans comprised of the 20% and US comprised of the 60% to satisfy the relationship of their ratios. 

Therefore, 60% of Michelle's collection is made up of US stamps.  
     
3 0
3 years ago
A flat rectangular piece of aluminum has a perimeter of 62 inches. The length is 15
dexar [7]

Answer:

Width of rectangular piece = x = 8 inches

Step-by-step explanation:

Perimeter of rectangular piece = 62 inches

Let width of rectangular piece= x

and length of rectangular piece = x+15

We need to find width i.e value of x

The formula used for perimeter of rectangle is: Perimeter=2(Length+Width)\\

Putting values in formula and finding Width:

Perimeter=2(Length+Width)\\\\62=2(x+x+15)\\62=2(2x+15)\\62=4x+30\\62-30=4x\\4x=32\\x=\frac{32}{4}\\x=8

After solving we get value of x = 8

So, Width of rectangular piece = x = 8 inches

5 0
3 years ago
How many three-digit numbers can be formed under each condition?
Leokris [45]

Answer:

(a) 900

(b) 648

(c) 180

(d) 600

Step-by-step explanation:

If there are no restrictions, there are 10 possible values for each digit of a three-digit number.

(a) The leading digit cannot be zero

There are 9 options for the first digit and 10 for the remaining digits.

n=9*10*10 = 900

(b) The leading digit cannot be zero and no repetition of digits is allowed.

n=9*9*8=648

(c) The leading digit cannot be zero and the number must be a multiple of 5.

If a number is a multiple of five, it must end in 0 or 5

n=9*10*2=180

(d) The number is at least 400.

If the number is at least 400, the first digit can only be 4, 5, 6, 7, 8 or 9. There are no restrictions for the remaining digits.

n=6*10*10=600

8 0
3 years ago
6xy — 4 y +6 - 4 x<br> Factorise this expression
otez555 [7]

Answer:

6xy-4y=2x+2x

2x+2x=4xbox

4xbox answer this fraction

4 0
3 years ago
The perimeter of a rectangle is 80 feet.
Phantasy [73]

Answer:

l=33 feet

w=7 feet

Area= 231 feet

Step-by-step explanation:

3 0
2 years ago
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