Can someone help me out

Mathematics

2 answers:

Likurg_2 [28]3 years ago

8 0

False i think, i did it in my head so it might be wrong, but im pretty sure its false. hope it helped

Sliva [168]3 years ago

6 0

True.

Distribute -3 to each monomial in the parenthesis.

-3(2x) = -6x
-3(-4) = 12
5x - 6x + 12

Combine like terms

5x - 6x = -x

-x + 12 (or 12 - x) is the equivalent expression

True is your answer

hope this helps

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Five cakes cost £4.00. how much do seven cakes cost?

natita [175]

The answer is $4.16
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3 years ago

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A red candle is 8 inches tall and burns at a rate of 7/10 inch per hour. A blue cans is 6 inches tall and burns at a rate of 1/5

Mazyrski [523]

Answer:

It would take 4 hours for both candles to be the same height

Step-by-step explanation:

Total time (t) for red candle to be same height (h) can be expressed as;

Final height after time t=Initial height-rate per hour

where;

Final height after time=h

Initial height=8 inches

Rate per hour=rate×time=(7/10)×t=0.7t

Substituting;

h=8-0.7t

Total time (t) for blue candle to be same height (h1) can be expressed as;

Final height after time t=Initial height-rate per hour

where;

Final height after time=h1

Initial height=6 inches

Rate per hour=rate×time=(1/5)×t=0.2t

Substituting;

h1=6-0.2t

Since h=h1

8-0.7t=6-0.2t

8-6=0.7t-0.2t

0.5t=2

t=2/0.5

t=4 hours

It would take 4 hours for both candles to be the same height

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4 years ago

Shoe sizes for men in the United States have a distribution that is bell shaped where = 10 and = 1.5. Using the empirical rule,

Talja [164]

Answer:

Step-by-step explanation:

Pictured is a normal distribution curve. The mean is in the middle and each line going from the middle is either adding or subtracting the standard deviation. Our mean is 10, so 10 goes in the middle, and the line to the right of 10 is 10+1.5=11.5. The next line to the right of that is 11.5+1.5=13. The line to the right of that is 13+1.5=14.5.

To the left of the mean we have 10-1.5=8.5. To the left of that we have 8.5-1.5=7. To the left of that we have 7-1.5=5.5. You can see in the image what the percentage is within each separation. From a size 7 to a size 13 we have the percentages 13.5+34+34+13.5=95%

In the greater realm of things, this statistic tells a shoe store manager that since 95% of men polled wear a shoe size between 7 and 13, it would be cost efficient for him to keep an abundance of these sizes on hand. The greatest majority of men polled (68%) wear from a size 8.5 to a size 11.5.