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Fiesta28 [93]
3 years ago
8

NEED HELP ASAP!!! IF YOU ANSWER RIGHT ILL MARK YOU BRAINLIEST!! (the calculator shown doesnt work for me)

Mathematics
1 answer:
Lana71 [14]3 years ago
7 0

Answer:

17-5n

Step-by-step explanation:

i believe it is asking for the nth term(english is my third language, i learnt this in italian, sorry if it's not what the question means)

the formula:

a(n) = a + d(n−1)

a(n)= nth term

a= first term

d= common difference

a(n) = a + d(n−1)

a(n)= 12+(-5)(n-1)

a(n)= 12-5(n-1)

a(n)=12-5n+5

a(n)=17-5n

You might be interested in
.
jarptica [38.1K]

Answer:

3 gallons

Step-by-step explanation:

Let

x ----> the amount of pure acid (100% solution) in gallons

Remember that

100\%=100/100=1

20\%=20/100=0.20

60\%=60/100=0.60

we know that

(1)(x)+(0.20)(3)=(0.60)(x+3)

solve for x

x+0.60=0.60x+1.80

x-0.60x=1.80-0.60\\0.40x=1.20\\x=3\ gal

therefore

3 gallons of pure acid should be mixed with 3 gallons of a 20% acid solution in  order to get a 60% acid solution

7 0
3 years ago
The scores of the quizzes of five students in both English and Science are:
vredina [299]

Answer:

0.23

Step-by-step explanation:

Given the data:

____(x) __(y)__(x - m1) /s1 ___(y-m2) /s2

1 ___6 ___8__ - 0.2 _______0.625

2 __5 ___ 5__ - 0.7________ - 1.25

3 __9____6__ 1.3 ________ - 0.625

4__ 4____ 7__ - 1.2 ______ 0

5__ 8 ____9 _ 0.8 _______ 1.25

For English :

Mean score(m1) = 6.4

Standard deviation (s1) = 2.0

For Science :

Mean score (m2) = 7.0

Standard deviation (s2) = 1.6

n = number of observations = 5

Correlation Coefficient (r) :

r = 1/(n - 1) Σ[((X - m1) / s1) * ((Y - m2) /s2)]

(-0. 2 * 0.625) + (-0.7 * - 1.25) + (1.3 * - 0.625) + (-1.2 * 0) + (0.8 * 1.25) = 0.9375

r = 0.9375/(5-1)

= 0.234

= 0.23

6 0
3 years ago
F=gMv^2/r solve for v
neonofarm [45]
First multiply the equation by r 
f*r=(mv^2) 
then divide by m f*r/gm=v^2 
put the equation all together you get v=sqrt(FrgM)/gM 
7 0
3 years ago
If you get it right I’ll give brainliest!
kifflom [539]

Answer:

Vertical

Step-by-step explanation:

We can see that the line is parallel to the y-axis. This is an indicator that the line is vertical.

On the other hand, if the line was parallel to the x=axis, it would indicate that it is horizontal.

I hope this helps!

3 0
3 years ago
Select the correct answer from each drop-down menu.
Pepsi [2]

Answer:

x =  63°

y  = 45°

z = 72°

Step-by-step explanation:

<u>Points to remember</u>

1).  Opposite angles of a parallelogram are equal

2). Adjacent angles of a parallelogram are supplementary

3). Sum of angles of a triangle is 180°

<u>To find the measures of given angles</u>

ABCD is parallelogram.

m<C = m<C = x =  63°

Consider triangle  ABD

m<A + m< B + m<D = 180

x + 72 + y = 180

y = 180 - ( 72 + x) = 180 - 135

y  = 45°

Also y + z + m<C = 180

45 + z + 63 = 180

z = 180 - 108

z = 72°

6 0
4 years ago
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