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Helga [31]
2 years ago
15

Expand 8(r + 6) please help !

Mathematics
1 answer:
Levart [38]2 years ago
6 0

Answer:

8r + 48

Step-by-step explanation:

In order to expand brackets you have to multiply everything inside the brackets by the number on the outside.

Therefore:

8 x r = 8r

8x 6 = 48

Put these together and you end up with 8r + 48.

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Find the equation (in terms of x) of the line through the points (-2,1) and(2,9)<br> Y=
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Answer:

2

Step-by-step explanation:

gradient =y² -y¹ /x²-x¹

=9-1/2--2

=8/4

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5 0
2 years ago
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You shopped online and found you mp3 player for $9.75 less than the store price p. The online price was $64. Write and solve an
katrin [286]

Answer:

  • 64 = p - 9.75
  • p = 73.75

Step-by-step explanation:

A value that is 9.75 less than p can be represented by the expression ...

  p - 9.75

We are told that value is equal to 64, so the equation is ...

  64 = p - 9.75

__

This equation is solved by adding 9.75 to both sides.

  64 +9.75 = p -9.75 +9.75

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The store price is $73.75.

4 0
3 years ago
If Y varies directly as X and Y= 79 when X= 49, Find Y if X = 9
ryzh [129]

Answer:

y = 14.5

Step-by-step explanation:

given that y varies directly as x

mathematically,

y ∝ x

y = kx .............................................. where k is the constant of proportionality.

k = y /x

given that

y = 79

x = 49

k = 79/49

k = 1.61

to find y when x = 9

from

y = kx

y = 1.61 × 9

y = 14.5

therefore the value of y when x = 9 in ths variation is evaluated to be equals to 14.5

7 0
3 years ago
Two similar prisms have heights 4 cm and 10cm what is the ratio of their surface areas
Slav-nsk [51]
Let k be the scale factor relating two similar prisms P_{1} and P_{2}, such that for corresponding parts of prisms P_{1} and P_{2} (for heights, in particular) we have k= \frac{height\  of \ P_{1} }{height \ of\  P_{2} }. In our case k= \frac{4}{10} = \frac{2}{5}.
For surfaces area we have \frac{Surface \ area \ of \  P_{1} }{Surface \ area \ of \  P_{2}} = k^{2} =( \frac{2}{5} )^{2}= \frac{4}{25}.
So, the right answer is 4:25 (choice B)



4 0
3 years ago
3a+5b-9: a=2, b=3 that is my question I need help
Zigmanuir [339]

Answer:

12

Step-by-step explanation:

7 0
3 years ago
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