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Colt1911 [192]
3 years ago
9

So i need H E L P... PLS help me

Mathematics
1 answer:
tensa zangetsu [6.8K]3 years ago
4 0

Answer:

A 3

Step-by-step explanation:

Let n = the number

a number decreased by 12

n-12

This is equal to 3 times the opposite =

3 times the opposite

3*(-n)

-3n

Setting the two parts equal

n-12 = -3n

Subtract n from each side

n-n-12 = -3n-n

-12 = -4n

Divide by -4

-12/-4 = -4n/-4

3 =n

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Jennifer has 25 coins with a total value of $4.25. The coins are quarters and nickels. How many of each does she have?
kirill115 [55]

Answer:

15 quarters, 10 nickels

Step-by-step explanation:

q+n=25

0.25q+0.05n=4.25

multiply the first equation by -0.25 and add the second equation to it

-0.25q-0.25n=-6.25\\0.25q+0.05n=4.25
________________
                -0.2n=-2

n=\frac{-2}{-0.2} =10   has 10 nickels

q=25-n=25-10=15  has 15 quarters

10(.05) +15(0.25) = 0.5 + 3.75 = 4.25

Hope this helps

8 0
9 months ago
Hey im new, could someone help me???<br> evaluate 3(2)(-1)
asambeis [7]

3(2)(-1)= 3×2×-1= 3×2=6×-1=-6 -6 is the answer

7 0
3 years ago
Read 2 more answers
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.35 inches and a standard deviatio
Fiesta28 [93]

Answer:

15.87%

Step-by-step explanation:

Notice that the mean of 0.35 inches with a standard deviation of 0.01 gives you when you add (to the right of the distribution), exactly 0.36. Since you want to find the probability (or percentage) of the bolts that have diameter LARGER than 0.36 in, that means you want to estimate the area under the Normal distribution curve from 0.36 to the right). See attached image.

We can use the tables of Z distribution for that, or the standard normal tables:

P(x>0.36) = P(z>(0.36-0.35)/0.01) = P(Z>1) = 0.1587 = 15.87%

7 0
3 years ago
Please show work
OlgaM077 [116]

Answer:

3.7hours

Step-by-step explanation:

Step one:

A car travels 360 miles in 8 hours

the speed is calculated as

speed= distance/time

speed= 360/8

speed= 45mph

Step two:

How much time will it take traveling 168 miles?

having found the speed, which is the rate at which the car is tavelling

time= distance/speed

time= 168/45

time= 3.7hours

8 0
3 years ago
Fastest land animal in the world answers
HACTEHA [7]

Answer:

Cheetah

Step-by-step explanation:

The cheetah or the Acinonyx jubatus can run up to 50 - 80 mph on land

Brainliest?

3 0
3 years ago
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