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natka813 [3]
3 years ago
8

This is 7th grade math please help!!

Mathematics
1 answer:
Kipish [7]3 years ago
5 0

Answer:

s

Step-by-step explanation:

ss

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What two numbers have a product of -36 and sum of -9​
Neporo4naja [7]

Answer:-12 and -25

Step-by-step explanation:

7 0
3 years ago
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9.4 The heights of a random sample of 50 college stu- dents showed a mean of 174.5 centimeters and a stan- dard deviation of 6.9
gladu [14]

Answer:  a) (176.76,172.24), b) 0.976.

Step-by-step explanation:

Since we have given that

Mean height  = 174.5 cm

Standard deviation = 6.9 cm

n = 50

we need to find the 98% confidence interval.

So, z = 2.326

(a) Construct a 98% confidence interval for the mean height of all college students.

x\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=(174.5\pm 2.326\times \dfrac{6.9}{\sqrt{50}})\\\\=(174.5+2.26,174.5-2.26)\\\\=(176.76,172.24)

(b) What can we assert with 98% confidence about the possible size of our error if we estimate the mean height of all college students to be 174.5 centime- ters?

Error would be

\dfrac{\sigma}{\sqrt{n}}\\\\=\dfrac{6.9}{\sqrt{50}}\\\\=0.976

Hence, a) (176.76,172.24), b) 0.976.

8 0
3 years ago
Find the surface area of the right triangle prism(above) using the net (below)
kifflom [539]

Answer:

144

Step-by-step explanation:

2( 1/2 × 3 × 4 ) + ( 11 × 5) + ( 11 × 4 ) + ( 11 × 3)

= 12 + 55 + 44 + 33

= 144

7 0
2 years ago
Please help me!!!!!!
Stels [109]

Answer: 72.5

Step-by-step explanation:

The average of 2 points is the midpoint so if I add 70 and 75 to get 145 and divide by the number of numbers which is 2 I get 72.5

7 0
3 years ago
Solve 3x−5 = 9.<br><br> x = −3<br> x = 2<br> x = 7<br> x = 8
Airida [17]
I hope this helps you




3x-5+5=9+5


3x=14


x=4,66666....
8 0
4 years ago
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