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3 years ago

Which expression is equivalent to 0? (a)(-a) a +(-a) a/-a a - (-a)

Mathematics

2 answers:

Sergeeva-Olga [200]3 years ago

8 0

A+(-a) equals zero because they cancel each other out .

(a)(-a) equals -a
a/-a equals -a
and
a-(-a) equals positive a

cupoosta [38]3 years ago

6 0

Answer:

a - a or (a +(-a))

Step-by-step explanation:

A negative plus a positive is always zero if they have the same variable.

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.6988271188 as fraction

MAXImum [283]

Answer: 1747067797/2500000000

Step-by-step explanation:

Rewrite the decimal number as a fraction with 1 in the denominator

0.6988271188=0.6988271188/1

Multiply to remove 10 decimal places. Here, you multiply top and bottom by 10 to the 10 power = 10000000000

0.6988271188/1 * 10000000000/10000000000 * 6988271188/10000000000

6 0

3 years ago

Click image to see it all..... thank you

Semmy [17]

Answer:

x = 7.5

Step-by-step explanation:

Proportions:

5 x

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6 9

7 0

3 years ago

Two sides of a triangle

True [87]

step 1: open brackets n rmb to flip the signs

step 2 (optional): rearrange to make the equation clearer to add/minus

length of 3rd side:

(8x + 3) - (2x + 1) -(5x + 2)

= 8x + 3 - 2x -1 - 5x -2

= 8x -2x -5x +3 -1 -2

= x

Therefore, length of 3rd side is X cm.

---

If perimeter = 75cm,

8x +3 = 75

8x = 75-3

8x = 72

x = 9 cm

Therefore,

1st side = 2(9) +1

= 19 cm

2nd side = 5(9) +2

= 47 cm

3rd side = 9 cm

4 0

3 years ago

What is an expression for the distance between the origin and a point P(x,y)

kirza4 [7]

Answer:

$d = \sqrt{ {x}^{2} + {y}^{2} }$

Step-by-step explanation:

Distance between origin (0, 0) and point (x, y) is given as:

$d = \sqrt{ {(x - 0)}^{2} + {(y - 0)}^{2} } \\ \\ \red{ \bold{ d = \sqrt{ {x}^{2} + {y}^{2} } }}$

5 0

2 years ago

Solve for x: -3 + x = -22

Tanya [424]

Answer:

x= -19

Step-by-step explanation:

-3 + x = -22

Add 3 to each side

-3+3 +x = -22 +3

x = -19

3 0

3 years ago