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2 years ago

From a sample of 80 batteries, 3 are faulty

Mathematics

1 answer:

andrew-mc [135]2 years ago

5 0

Answer:

sry I just wanted the points I'm in middle school so I don't know this stuff either but can you give free brainlyest I'm soo close to my next rank I'd really appreciate it if you would

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The sum of two numbers is 27. One number is seven less than the other. Find the numbers

Marat540 [252]

Answer:

17 and 10

Step-by-step explanation:

Write the problem as an equation.

a+b=27

a=b-7

Where a and b are the two numbers you are trying to find. You could use any variables. Then solve.

b+(b-7)=27 Sub (b-7) for a

2b-7=27 Group like terms

2b=34 Add 7 to both sides

b=17 Divide both sides by 2.

Because b=17, a must be 10.

6 0

4 years ago

a hang glider had a change in elevation of -901 ft in 34 minutes. What was the rate of descent, in seconds? Answer in decimal fo

fredd [130]

Answer:

-26.5 ft per minute

Step-by-step explanation:

To find rate of change, you can just divide.

-901 ft ÷ 34 minutes = -26.5 ft / minute

4 0

3 years ago

You must attend a minimum of 85% of the practices in order to play in the playoffs. You have made 37 of the 42 practices. Will y

suter [353]

Answer:

Yes, you will be able to play in the playoffs.

Step-by-step explanation:

37 ÷ 42 = 0.88095238095238 = 88.095238095238%.

~88%>85%

6 0

3 years ago

Find the value of the variable and YZ if Y is between X and Z. <br><br> XY=4n+3, YZ=2n-7,XZ=22

ruslelena [56]

Answer:

$\large \boxed{n = \dfrac{13}{3}; YZ = \dfrac{5}{3}}}$

Step-by-step explanation:

I think you have the situation shown in the diagram below.

1. Calculate the value of n

$\begin{array}{rcl}XY + YZ & = & XZ\\4n+ 3 + 2n - 7 & = & 22\\6n - 4 & = & 22\\6n & = & 26\\n & = & \dfrac{26}{6}\\\\& = & \mathbf{\dfrac{13}{3}}\\\end{array}\\\large \boxed{\mathbf{n = \dfrac{13}{3}}}$

2. Calculate the value of YZ

$\begin{array}{rcl}YZ & = & 2n - 7\\& = & 2\left (\dfrac{13}{3}\right ) - 7 \\\\& = & \dfrac{26}{3} - 7\\\\& = & \dfrac{26}{3} - \dfrac{21}{3}\\\\& = & \dfrac{5}{3} \\\\\end{array}\\\large \boxed{YZ = \mathbf{ \dfrac{5}{3}}}$

7 0

3 years ago

A survey was conducted to determine how many movies were seen in one month among the 26 students in mrs Hampton’s sixth grade cl

gtnhenbr [62]

There’s not enough information to solve this problem

5 0

3 years ago