All categories

4 years ago

QUICK MATH QUESTION! Help please :) :)

Mathematics

2 answers:

Crank4 years ago

7 0

(3)^2 - 7(3) - 4

9 - 21 - 4

-16

Mama L [17]4 years ago

5 0

In order to evaluate this expression, we plug in 3 where ever we see n. The equation becomes:

$3^{2}-7*3-4=9-21-4=-16$

So, this expression is equal to -16.

You might be interested in

Solve the quadratic equation by factoring. 7K^2-6k+3=3

ivann1987 [24]

Subtract 3 to get:

7k^2-6k=0

Clearly, we can factor out a k to find that:

k(7k-6)=0

If either k or 7k-6 is zero, the whole expression is zero, so our solutions are zero and 6/7.

6 0

3 years ago

Read 2 more answers

A bicycle manufacturing company makes a particular type of bike. Each child bike requires 4 hours to build and 4 hours to test.

hoa [83]

Answer:

4c + 6a < = 120 ...4(20) + 6(6) = 116 <== correct

Step-by-step explanation:

7 0

2 years ago

I need help with this ASAP please help. Look at the picture

atroni [7]

I am not entirely sure if this is correct, so forgive me if I am wrong

(┬┬﹏┬┬)

Answer: 266,667 bottles

Step-by-step explanation:

80/300 people preferred soft drink z. This as a decimal is 0.2666

This means that out of the million, 0.2666666666666667% need to be soft drink z

1,000,000x0.2666666666666667 =266,666.667

This can be rounded to 266,667 bottles of soft drink z

(I chose to include the whole decimal for the most accurate results, and save rounding for the last step)

6 0

3 years ago

A rule for nth term of -2 , -5/4 ,-1/2,1/4

miv72 [106K]

Answer:

Step-by-step explanation:

This is an arithmetic sequence

a1 = -2

Difference = 2nd term - first term

$=\frac{-5}{4}-[-2]\\\\=\frac{-5}{4}+2\\\\=\frac{-5}{4}+\frac{2*4}{1*4}\\\\=\frac{-5+8}{4}=\frac{3}{4}$

$a_{n}=a+(n-1)d\\\\=-2+(n-1)*(\frac{3}{4})\\\\=-2+\frac{3}{4}n-\frac{3}{4}\\\\=\frac{-2*4}{1*4}-\frac{3}{4}+\frac{3}{4}n\\\\=\frac{-8-3}{4}+\frac{3}{4}n\\\\=\frac{-11}{4}+\frac{3}{4}n$

6 0

4 years ago

Leanne runs a lap in 12 minutes. Kory runs a lap in 9 minutes. If they

klemol [59]

Kory and Leanne will meet each other again after 36 minutes from starting i.e. at 10:36 am .

<u>Step-by-step explanation:</u>

Here we have , Leanne runs a lap in 12 minutes. Kory runs a lap in 9 minutes. We need to find out that If they both start running at 10 am, at what time will they both cross the start together again . Let's find out:

Kory runs a lap in 9 minutes and , Leanne in 12 minutes , in order to find at what time will they both cross the start together again we will find LCM of 9 & 12 :

⇒ $\frac{9(4)}{12(4)}$

⇒ $\frac{36}{36}$

So ,LCM of 9 & 12 is 36 .That means Kory and Leanne will meet each other again after 36 minutes from starting i.e. at 10:36 am .

In clear way , Kory will run race as :

1st lap = 9 minutes

2nd lap = 18 minutes

3rd lap = 27 minutes

4th lap = 36 minutes , i.e. at 10:36 am he'll complete his 4th lap

For , Leanne

1st lap = 12 minutes

2nd lap = 24 minutes

3rd lap = 36 minutes i.e. at 10:36 am he'll complete his 3rd lap .

This means Kory & Leanne will meet at 10:36 am completing there 4th and 3rd lap respectively .

6 0

4 years ago