Answer:
The missing number is 21
Step-by-step explanation:
-12 + x = 9
x = 9 + 12
x = 21
Answer:
Length = 9units
Width = 7units
Step-by-step explanation:
It is said that the length is 2units more than the width
Assume that the width is x, then the length will be 2 + x
ie
Width = x
Length = 2 + x
Area of the rectangle = 63units
Area of rectangle = l * b
l - length of the rectangle
b - width of the rectangle
A = l * b
63 = (2 + x) * x
63 = ( 2 + x) x
63 = 2x + x^2
Let's rearrange it
x^2 + 2x - 63 = 0
Let's find the factor of 63
A factor that can be multiplied to give -63 and that can be added to give +2
Let's use -7 and +9
x^2 - 7x + 9x - 63 = 0
Separate with brackets
( x^2 - 7x) + ( 9x - 63) = 0
x( x - 7) + 9(x - 7) = 0
( x + 9)(x - 7) = 0
( x + 9) = 0
( x - 7) = 0
x + 9 = 0
x = -9
x - 7 = 0
x = 7
Note: the length of a rectangle can not be negative
So therefore,
x = 7
Length = 2 + x
= 2 + 7
= 9units
Width = x
= 7units
<span><span><span>the underlined 2 in <u>2</u>22,222 is in the hundred thousand place (two hundred thousand)</span></span></span>
<span><span><span />the underlined 2 in 2<u>2</u>2,222 is in the ten thousand place (twenty thousand)</span></span>
<span><span />the underlined 2 in 22<u>2</u>,222 is in the thousand place (two thousand)</span>
<span /><span>the underlined 2 in 222,<u>2</u>22 is in the hundred place (two hundred)</span>
<span>the underlined 2 in 222,2<u>2</u>2 is in the ten place (twenty)</span>
<span>the underlined 2 in 222,22<u>2</u> is in the ones place (two)
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