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anygoal [31]
2 years ago
8

The sum of a number and twelve is twenty-one. What is the number? 21 n 12 8 9 10 33

Mathematics
2 answers:
Sonbull [250]2 years ago
4 0

Answer:

9

Step-by-step explanation:

Subtract 1 2 12 12 from both sides of the equation + 1 2 = 2 1 + 1 2 − 1 2 = 2 1 − 1 2 2 Simplify Solution = 9

UkoKoshka [18]2 years ago
3 0

Answer:

9+12=21

Step-by-step explanation:

You might be interested in
Question:4x²-9 <br>answer:​
statuscvo [17]

Step-by-step explanation:

4x^2-9

=(2x)^2 -3^2

=(2x+3) (2x-3)

Hope this helps you.

3 0
2 years ago
Determine the value of y when x=15 if y=6 when x =30
Vladimir79 [104]
6+9=15
y+9=x
x=30
y+9=30
y=21
6 0
3 years ago
Question 17
Rufina [12.5K]

Answer:

698 fishes

Step-by-step explanation:

Generally, we can represent an exponential growth function as;

y = a•(1 + r)^t

originally, there were 3 fishes

The original value in this case means a = 3

After 6 weeks, there were 31

31 in this case is y

r is the increase percentage or rate

t is the time

So, we have it that;

31 = 3•(1 + r)^6

31/3 = (1 + r)^6

10.33 = (1 + r)^6

ln 10.33 = 6 ln (1 + r)

ln 10.33/6 = ln (1 + r)

e^0.3892 = (1 + r)

1 + r = 1.476

r = 1.476-1

r = 0.476 or 47.6%

So the growth percentage or rate is 47.6%

For 14 weeks, we simply have the value of t as 14;

So ;

y = 3•(1 + 0.476)^14

y = 3(1.476)^14

y = 698 fishes

8 0
2 years ago
Dylan owes half as much money as he used to owe. If he used to owe $28, which of the following expressions would reflect how muc
IrinaVladis [17]

Answer:

it is the second one i had this question. mark as brainliest

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
A group of 2n people, consisting of n men and n women, are to be independently distributed among m rooms. Each woman chooses roo
vfiekz [6]

Step-by-step explanation:

Assume that

X_i = \left \{ {{1, If , Ith, room, has,exactly, 1,man, and , 1,woman } \atop {0, othewise} \right.

hence,

x = x_1 + x_2+....+x_m

now,

E(x) = E(x_1+x_2+---+x_m)\\\\E(x)=E(x_1)+E(x_2)+---+E(x_m)

attached below is the complete solution

7 0
3 years ago
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