MATHEMATICS HIGH SCHOOL

Cary is 5 5 years older than dan. in 5 years the sum of their ages will be 81. find the age of each man now.

Answers

Answer 1
Answer: C = Cary, D = Dan
C - 55 = D
(C + 5) + (D + 5) = 81
C = D + 55
(D + 55 + 5) + (D + 5) = 81
(D + 60) + (D + 5) = 81
2D = 16
D = 8
C = 8 + 55 = 63

Cary is 63 years old, and Dan is 8 years old
Answer 2
Answer: Let's call x the age of Cary and y the age of Dan.

y = x - 55
x + 5 + y + 5 = 81

Then,

x + 5 + x - 55 + 5 = 81
2x - 45 = 81
2x = 81 + 45
2x = 126
x = 126/2 = 63

Now, let's find y.

y = 63 - 55 = 8.

Therefore Cary is 63 years old and Dan is 8 years old.

Hope this helps !

Photon

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HIGH SCHOOL

Solve for n. then find the value of m for each value of n
8n=-3m+1

Answers

Basically, solve for n, then find aanother tha is solve for m


8n=-3m+1
divide both sides by 8
n=-3/8m+1/8

and find m
8n=-3m+1
minus 1 both sides
8n-1=-3m
divide both sides by -3
-8/3n+1/3=m
m=-8/3n+1/3

MIDDLE SCHOOL

Some seventh-grade students at Michaelson Middle School were surveyed to find the amount of time they spent doing homework over the past two nights. What is the mean amount of time spent on homework per student? Amount of Time Spent Number of
on Homework(Hours) Students
2 4
3 5
4 6
5 3
6 3
7 0
8 1

Answers

The word mean is a synonym for average. To find the average, you add all of the data, then divide by the amount of data received.

So, we add 2+4+3+5+4+6+5+3+6+3+7+0+8+1. That totals to 57. Then, we divide by 14 because there are 14 answers. The end result is 4.07, because we round up.
MIDDLE SCHOOL

What is the domain of f(x) = 5^x - 7?

Answers

X belongs to all real numbers
MIDDLE SCHOOL

Which expression is equivalent to 21 × 7? A) 7 × 21
B) (3 x 7) + 7
C) (10 + 7) × 11
D) (21 + 7) × (7 + 21)

Answers

I wanna say the answer is A

MIDDLE SCHOOL

Plz show your work and answer quickly. I'll give brainliest! When Jim surveyed 5 sixth-grade students at the community skating rink, he found that only 1 out of the 5 had completed the science project. He knows there are about 160 sixth-grade students in his community, so he infers that around 32 students have finished their science project. Is this a good inference?

No, Jim did not make a good inference because his sample is too small and may be biased because he only asked students that were at the rink.
No, Jim did not make a good inference because his sample is too small and 32 is not in the same proportion to the population as 1 to 5.
Yes, Jim made a good inference because 32 is the same proportion to the population as 1 to 5.
Yes, Jim made a good inference because most students at the rink were sixth graders.

Answers

Hello there! :)

Jim only interviewed 5 students, all of which were at the same place. 

So, no. Jim did not make a good inference because his sample is too small and may be biased because he only asked students that were at the rink. 

If he asked students in multiple places or asked more people, it may have been a better inference. 

The correct answer is "A". 

~'Manda

No, Jim did not make a good inference because his sample is too small and may be biased because he only asked students that were at the rink.

HIGH SCHOOL

Find three consecutive integers whose sum is 468

Answers

468/ 3 = 300+168
300/3 = 100 168/3 = 56 
100 + 56 = 156
that is your middle number
155 156 157
MIDDLE SCHOOL

Write the set in set builder notation {2,4,6,8,10,12}

Answers

The set builder notation is  {x : x =  2n where n ∈ N and n < 6}.

What is a set?

A set is a group or collection of objects or numbers, considered as an entity unto itself.  

Now the given set is,

Let S = {2,4,6,8,10,12}

Now, Set-builder notation describe a set by saying what properties its members have.

It uses curly brackets called "braces".

The first part after the first curly bracket tells you what set of numbers x belongs to.  

The ∈ symbol means "is an element of".  

Now,  x = 2n where n ∈ N

and n < 6

Therefore, the required set builder notation is,

S = {x : x =  2n where n ∈ N and n < 6}

Thus, the set builder notation is  {x : x =  2n where n ∈ N and n < 6}

To learn more about set builder notation:

brainly.com/question/27913822

#SPJ2

Answer:

{x∈Z+ | x is an even, 2≤x≤12}

Step-by-step explanation:

∈ = elememt of

Z+ = +ve integer

even = even no.

≤ = smaller than or equal to

HIGH SCHOOL

All isosceles right triangles are similar. True False

Answers

The answer is False.............................................................................................

Answer:

True

Step-by-step explanation:

I used the other persons answer and i got it wrong

Hope this helps

HIGH SCHOOL

10x10x10x10x10x10x10

Answers

The answer is 70 : )
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