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tatiyna
3 years ago
14

Break apart the addends to find the sum 18+21

Mathematics
1 answer:
ololo11 [35]3 years ago
3 0
We break apart the first numer:

10+8

the second:

20+1

and add like this:

18+21=10+8    +  20+1

now, we can mix up the order:

18+21=10+8    +  20+1= 10+20     + 8+1

add the parts:

18+21=10+8    +  20+1= 10+20     + 8+1=30+9=39




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7th grade math. Please help me so I can go to 8th grade math. :)
pogonyaev
35 degrees is your awnser


5 0
3 years ago
Read 2 more answers
Heres the picture, i appreciate it!
Alex777 [14]

Answer:

please last option

using 45 degree as reference angle

using tan relation

Tan45=perpendicular /base

1 = x\6

x = 6

now using right angled triangle relation

H²=p²+b²

then h²= 6²+6²

H = √36+36

H =6√2

therefore y=6√2

5 0
3 years ago
HELP PLZ DONT TROLL I NEED THIS ITS DUE NEXT PEROID
Savatey [412]

Answer:

4x -4 24

Step-by-step explanation:

Remember distribution, 4 × x then 4 x -6

7 0
3 years ago
C=4.62 a =2.2 what is c
DaniilM [7]

Answer: if your question was C-A then it would be 2.42

Step-by-step explanation:

4.62-2.2

7 0
3 years ago
What to the third power is equal to 729
atroni [7]

If you had absolutely no idea, then you'd have roughly two choices
of how to find it:

#1).  Try numbers until you find the right one.

        Pick a number.
        Cube it.
        If you get less than 729, go back and try a bigger number.
        If you get more than 729, go back and try a smaller number.
        Eventually you find the right one.  

Try 1.        1³ = 1 .            Too small.
Try 2.        2³ = 8 .            Still too small.
Try 5.        5³ = 125 .        Still too small.
Try 20.     20³ = 8,000.      Ooops.  Too big.
Try 10.     10³ = 1,000       Too big.
Try 8.         8³ = 512.         Oooo.  Too small, but maybe getting close.
Try 8.5.    8.5³ = 614.125   Still too small, but very close.
Try 9.         9³ = 729 .       That's it !            yay !


#2).  x³ = 729

Take the log of each side:      log(x³) = log(729)

                                         3 log(x)  =  log(729)

Divide each side by  3 :         log (x)  =  (1/3) log(729)

Look up log(729) :                 log(x)  =  (1/3) (2.86272...)

                                                      =    0.95424...
Raise 10 to the power
of each side:                      10^log(x)  =  10⁰·⁹⁵⁴²⁴···  

                                               x        =  8.99994...

                                         (That's the way it is with logs.
                                          They never come out even.)
5 0
3 years ago
Read 2 more answers
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