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strojnjashka [21]
3 years ago
6

Solve 10(y+7)=12y for y

Mathematics
2 answers:
12345 [234]3 years ago
7 0

Answer:

y=35

Step-by-step explanation:

10(y+7)=12y

10y+70=12y

70=12y-10y

70=2y

70/2=y

35=y

therefore, y=35

astraxan [27]3 years ago
5 0

Answer:

y=35

Step-by-step explanation:

10(y+7)=12y

10xY and 10x7 which would be 10y+70=12y

subtract 10y from 12y= 2y

2y=70, divide 2 by 70 which equals 35.

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a sequence starts a 200 and 30 is subtracted each time 200,170,140 what are the first two numbers in the sequence that are kess
Snowcat [4.5K]
<h3>Answer:  -10 and -40</h3>

===============================================================

Explanation:

a = 200 = first term

d = -30 = common difference

Tn = nth term

Tn = a + d(n-1)

Tn = 200 + (-30)(n-1)

Tn = 200 - 30n + 30

Tn = -30n + 230

Set Tn less than 0 and isolate n

Tn < 0

-30n + 230 < 0

230 < 30n

30n > 230

n > 230/30

n > 7.667 approximately

Rounding up to the nearest whole number gets us n \ge 8

So Tn starts to turn negative when n = 8

We can see that,

Tn = -30n + 230

T7 = -30*7 + 230

T7 = 20

and

Tn = -30n + 230

T8 = -30*8 + 230

T8 = -10 is the 8th term

and lastly

Tn = -30n + 230

T9 = -30*9 + 230

T9 = -40 is the ninth term

Or once you determine that T7 = 20, you subtract 30 from it to get 20-30 = -10 which is the value of T8. Then T9 = -40 because -10-30 = -40.

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