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Sonbull [250]
3 years ago
11

Place a check mark next to each expression that is equivalent to - 2/3

Mathematics
2 answers:
12345 [234]3 years ago
5 0
What are the expressions

Anettt [7]3 years ago
4 0
I cant answer the question without expression 
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You have a mean score of 84 after taking five 100-point tests. What do you need to score on the sixth 100-point test to have a m
kap26 [50]
The mean of n numbers is the sum of the numbers divided by n.

You have a mean score of 84 after taking 5 tests. Let x be the sum of scores.
\frac{x}{5}=84 \\
x=84 \times 5 \\
x=420
You scored a total of 420 points on five tests.

You need to have a mean score of 85 after taking 6 tests. Let y be the score you need to obtain. Your total score on 6 tests is 420+y.
\frac{420+y}{6}=85 \\
420+y=85 \times 6 \\
420+y=510 \\
y=510-420 \\
y=90

You need to score 90 points on the sixth test.
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3 years ago
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Which irrational number can be multiplied by - 141 to get a product that equals 1?
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Answer:

d

Step-by-step explanation:

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Ayala and sam were partners on a science project. Ayala spent 2 3/4 hours working on the project.Sam spent 1 3/4 on the project.
sergij07 [2.7K]

Answer:

  4 1/2 hours

Step-by-step explanation:

Total time worked was ...

  2 3/4 + 1 3/4 = (2 +1) + (3/4 +3/4)

  = 3 + (1 1/2) = 4 1/2 . . . hours

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The lengths of the sides of a triangle are in the extended ratio 5: 8:10. The perimeter of the triangle is 115 cm. What are the
leva [86]

Given :

  • The length of the sides of the triangle are in the ratio 5:8:10 .
  • The Perimeter of the Triangle is 115 cm.

To Find :

  • The length of the sides of the triangle.

Solution :

Let us assume the sides be 5x cm, 8x cm and 10x cm.

We know,

\qquad{ \bold{ \pmb{Sum \: of \: all \: sides \: of \: the \: triangle = Perimeter_{(Triangle)}}}}

So, Substituting the values :

\qquad { \dashrightarrow{ \sf{5x + 8x + 10x = 115}}}

\qquad { \dashrightarrow{ \sf{23x= 115}}}

\qquad { \dashrightarrow{ \sf{ \dfrac{23x}{23} = \dfrac{115}{23} }}}

\qquad { \dashrightarrow{ \bf{ x = 5 }}}

Therefore,

The length of the sides of the triangle are :

\qquad { \dashrightarrow{ \sf{ 5x \: cm= 5 \times 5 \: cm = \bf \: 25\: cm }}}

\qquad { \dashrightarrow{ \sf{ 8x \: cm= 8 \times 5 \: cm = \bf \: 40 \: cm }}}

\qquad { \dashrightarrow{ \sf{ 10x \: cm= 10 \times 5 \: cm = \bf \: 50 \: cm }}}

6 0
3 years ago
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