(d)

Mathematics

1 answer:

mash [69]2 years ago

6 0

Answer: The 4 answers are x=18, x=3, x=48, x=81 1/2.

Step-by-step explanation: Isolate the variable by dividing by each side by factors that don't contain the variable.

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Need help fast!!! Algebra question!!!

ddd [48]

AVERAGE between 90 and 100%
means not including 90 and 100% but not including 90 or 100%

average=(sum of values in set)/(how many values in the set)

so
4 exams, so there are 4 values
average=(sum)/4

the sum is the known+unknwon
sum=76+99+86+x

so
90<average and average <100
or
90<average<100

lets say average=a

a=sum/number
a=(76+99+86+x)/4

90<(76+99+86+x)/4<100
90<(76+99+86+x)/4 and (76+99+86+x)/4<100

solve each for x and find intersection

90<(76+99+86+x)/4
times 4 both sides
360<261+x
minus 261 both sides
99<x

(76+99+86+x)/4<100
times 4 both sides
261+x<400
minus 261 both sides
x<139

so

99<x<139
since max score is 100
99<x<100

interval notaion is
[99,100]

answer is 2nd one

3 0

2 years ago

Read 2 more answers

Please helppp!!!!!!!!!

koban [17]

It is (1,15). I recommend using a website called desmos because it helps with graphing.

3 0

3 years ago

Read 2 more answers

The diameter of Mercury is approximately 4.9×103 kilometers. The diameter of Earth is approximately 1.3×104 kilometers. About ho

-Dominant- [34]

Hi there!

To get the answer to this question, let's divide the diameter of the Earth by the diameter of Mercury.

$\frac{1.3*10^4}{4.9*10^3}$

We can change this to

$\frac{1.3}{4.9}*\frac{10^4}{10^3}$

Let's solve for each individual fraction

$\frac{1.3}{4.9}$ ≈ 0.27

$\frac{10^4}{10^3}$ = 10

Now, multiply.

0.27 * 10 = 2.7

That's your answer.

Have an awesome day/night! :)

~collinjun0827, Junior Moderator

5 0

2 years ago

7.29 divided by 90 is ?

muminat

Answer:

0.081

Step-by-step explanation:

7.29 divided by 90 = 0.081

6 0

2 years ago

Help me with this question please!!

mariarad [96]

It should be answer B

7 0

3 years ago