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vampirchik [111]
3 years ago
10

Add or subtract mentally 16.9+ 12.1

Mathematics
2 answers:
saul85 [17]3 years ago
7 0
When you add it mentally you'd get 29
When you subtract it mentally you'd get 4.8
Ostrovityanka [42]3 years ago
6 0
Well, just add or subtract it form the back and work your way to the front, and you have to remember what the digit was.

16.9 + 12.1 = 29
16.9  - 12.1 = 4.8
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A jar contains n nickels and d dimes. There is a total of 206 coins in the jar. The value of the coins is $13.95. How many nicke
OLga [1]

Answer:

73 dimes and 133 nickels

Step-by-step explanation:

$13.95 = 1395 cents

5n + 10d = 1395     (since each nickel is 5 cents and each dime is 10 cents)

5n = 1395 - 10d      (subtract 10d from both sides to solve for n)

n = 279 - 2d

n + d = 206

279 - 2d + d = 206   (substitute n with the previous expression)

279 - d = 206         (add variable d and -2d)

-d = -73        (solve for d and divide both sides by negative 1)

d = 73          

n + 73 = 206 (solve for n and subtract both sides by 73)  

n = 133

6 0
3 years ago
Help with #5, 6, 7, and 8 <br> pleasee
lesya [120]
5. It is a 5/9 chance he will pick 2 pair of pants. There are 5 pants and 9 in total (clothes and pants)
7. It is a 3/9 chance he will pick 2 items that are black. There are only 3 things that are black and the rest are other colors.
8. It is a 2/9 chance he will pick a pant and a shirt that is white. There is 1 white pants and 1 white shirt.


That is all I know. Number 6 kind of confuses me. Hope I helped!!!
8 0
3 years ago
B-13=7 как решить этот уровнения​
beks73 [17]

Answer:

b equals 20

Step-by-step explanation:

b - 13 = 7

7 + 13 = b

7 + 13 = 20

7 0
3 years ago
What type of triangle has side lengths 4, 4/15, and 16?
zvonat [6]

Answer:

answer a. Because 16^2=256

4^2+ 4/15^2=16.01

16.01<256 . Therefore, it is acute-angled acute

6 0
2 years ago
If you have 186 pencils, how many how many will each person get in a class that has 23 students?
Brut [27]

Answer:

8

Step-by-step explanation:

total number of pencils = 186

number of students = 23

number of pencils each student gets = number of pencils ÷ number of pencils

=186/23

=8.08

so each student gets 8 pencils

6 0
3 years ago
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