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Schach [20]
4 years ago
9

1-3(n+5)=-8 distributived

Mathematics
1 answer:
scoray [572]4 years ago
6 0
1 - 3(n+5) = -8
1 (-1) - 3n - 15 = -8 (-1)
-3n - 15 = -9
-3n - 15 (+15) = -9 (+15)
-3n = 6
-3n/-3 = 6/-3
n = -2

hope this helps
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Rewrite 2 ^ x = 128as a logarithmic equation !???
Luda [366]

Answer:

log 2 ( 128 ) = x So C.

Step-by-step explanation:

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3 years ago
A recipe for apple cider cause for 4 cups of apple juice and 3 cups of water what equation can we use to find extra percent of a
evablogger [386]

Answer:

% Apple juice = \frac{4}{7} × Y × 100.

Step-by-step explanation:

Given:

Ratio of apple juice to water = 4 : 3 = Y i.e 4+ 3 = 7

To find the exact % of apple juice used in  recipe, we use the ratio of juice to water provided, given Y as any amount of apple cider.

∴ equation \frac{4}{7} × Y = amount of apple juice.

for percentage, \frac{4}{7} × Y × 100 = amount of apple juice.

Proof:

In 200ml apple cider, amount of apple juice present

= 4/7 × 200 = 114.2ml of juice

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I hope this was helpful.

4 0
3 years ago
A train leaves Philadelphia at 2:00 PM. A second train leaves the same city in the same direction at 4:00 PM. The second train t
polet [3.4K]

Answer: First train speed shall be 42 mi/hr

Second train speed shall be 84 mi/hr

Yes it is the valid answer, it gets annoying when almost everyone enters the wrong answer for a good laugh. Either way, hope this helps! Have a spectacular day.

Step-by-step explanation:

What is the 1st train's head start in miles?

Let +s+ = the speed of the 1st train in mi/hr

From 2PM to 4PM is 2 hrs

+d%5B1%5D+=+s%2A2+

---------------------

Let +d+ = distance the 2nd train travels until

it overtakes the 1st train

From 4PM to 6PM is 2 hrs

Start time when the 2nd train leaves

---------------------

Equation for 1st train:

(1) +d+-+2s+=+s%2A2+

Equation for 2nd train:

(2) +d+=+%28+s%2B42+%29%2A2+

--------------------

Substitute (2) into (1)

(1) +%28+s%2B42+%29%2A2+-+2s+=+s%2A2+

(1) +2s+%2B+84+-+2s+=+2s+

(1) +2s+=+84+

(1) +s+=+42+

and

+s%2B+42+=+42+%2B+42+

+s+%2B+42+=+84+

------------------

The 1st train's speed is 42 mi/hr

The 2nd train's speed is 84 mi/hr

---------------------------

check:

(2) +d+=+%28+s%2B42+%29%2A2+

(2) +d+=84%2A2+

(2) +d+=+168+

and

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(1) +d+-+2%2A42+=+42%2A2+

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(1) +d+=+168+

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3 years ago
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Step-by-step explanation:

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