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Arlecino [84]
3 years ago
15

Im not good at this unit

Mathematics
2 answers:
Wittaler [7]3 years ago
7 0

Answer:

we need the actual problem

Step-by-step explanation:

please post a photo or just type out the question

postnew [5]3 years ago
5 0
Which unit, I’ll try to help but I need the problem
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Perform the indicated operation<br>7+9+(4)<br>20<br>20<br>O12<br>O-12​
Ivahew [28]
The answer would be 20.

How?

7 + 9 = 16

16 + 4 = 20
7 0
3 years ago
Help please
user100 [1]

Answer:

31 (i.e 3 tens and 1 unit)

Step-by-step explanation:

217 can be split up as,

2 hundreds, 1 tens, and 7 units.

186 can be split up as,

1 hundred, 8 tens and 6 units

If we solve straight we'll have

(2-1)hundreds + (1-8)tens + (7-6)units.

(1-8)tens will give a negative value, complicating the operation.

To make our operation easier we can use the fact that 1 hundred is equal to 10 ten to further split the 217, and it becomes

1 hundred, 11 tens and 7 units.

The operation becomes

(1-1)hundreds + (11 - 8)tens + (7-6)units

= 0 hundred + 3tens + 1 unit

= 3 tens + 1unit

= (3 x 10) + 1 = 31

4 0
2 years ago
A regular decagon has 10 sides. How many reflectional symmetries does a regular decagon have?
lina2011 [118]

The rule for regular polygons are very easy. The number of reflectional symmetries is same as the number of sides. Regular polygons have all sides the same length and all angles same. Reflection symmetry means that you can fold the shape along that line and it will match up.

For this question, we want the number of reflectional symmetries of a regular decagon. Decagon is a 10 sided figure. Hence, the number of reflectional symmetries is 10.

There are 5 symmetry lines from one vertex to opposite vertex and 5 more symmetry lines form midpoint of one side to midpoint of opposite side.

ANSWER: 10

7 0
3 years ago
Read 2 more answers
Find the y-intercept from the line passing through (1, 3) and having slope m=2.
Troyanec [42]

Answer:

The y intercept is 1

Step-by-step explanation:

The slope intercept form of a line is

y = mx+b  where m is the slope and b is the y intercept

y = 2x+b

Substitute the point into the equation and solve for y

3 = 2(1)+b

3 =2+b

1 = b

The y intercept is 1

8 0
2 years ago
Read 2 more answers
Solve this equation: -3r -6(-7-10r)
blondinia [14]
Answer: 57r + 42

Step by step explanation:

-3r - 6(-7 - 10r)

Distribute -6 through the parenthesis

-3r + 42 + 60r

Collect the like terms

57r + 42
7 0
3 years ago
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