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Mariana [72]
3 years ago
12

Evaluate and simplify

Mathematics
1 answer:
nekit [7.7K]3 years ago
6 0

Answer:

20

5r +7s -3(r+s) + 4 = 5r +7s - 3r -3s +4 = 2r +4s +4 = 2(r +2s +2)

when sub r=2, s=3,

2(2+2(3) +2) = 20

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Answer asap please!!
morpeh [17]
60.
Multiply
3 by 20.
You can do this on paper,
20
x
3
____
60
Multiply the ones spot first, 0 x 3 is 0 so add that in your ones spot, then go 2x3 since nothing is under to, just go to 3 and you’ll get 6, which you add to the tens spot.
Have a good day!
6 0
3 years ago
You brought 9 feet of elastic to make hair ties each hair ties need 3 3/8 inches of elastic how many hair ties can you make
PIT_PIT [208]

Answer:

32\ hair\ ties

Step-by-step explanation:

we know that

To make one hair ties is needed 3 3/8 inches of elastic

so

using proportion

Find out how many hair ties can you make with 9 feet of elastic

Remember that

1\ ft=12\ in

Convert 9 ft to inches

9\ ft=9*12=108\ in

Convert mixed number to an improper fraction

3\frac{3}{8}\ in=\frac{3*8+3}{8}=\frac{27}{8}\ in

using proportion

\frac{1}{(27/8)}=\frac{x}{108}\\\\x=108*8/27\\\\x=32\ hair\ ties

3 0
3 years ago
The largest doll is 12 inches tall. the height of each of the other dolls is 710710 the height of the next larger doll. write an
GrogVix [38]

the question doesn't say how many dolls. there would be an infinite number.  
But we'll just form the equation for the nth doll.     
 Largest doll = 12 inches
 2nd doll = (12) x 0.7
 3rd doll = (12 x 0.7) x 0.7
 4th doll = [(12 x 0.7) x 0.7) x 0.7 
  
 OK, We now see the pattern. Each successive doll is mult by the previous

doll height x 0.7
 the Nth doll, 12 is mult by 0.7(n-1)  
 So, the height of the nth doll can be expressed as: 12 x 0.7(n-1)  
 example: 4th doll = 12 x 0.7(4-1) = 12 x 0.73
  10th doll = 12 x 0.7(10-1) = 12 x 0.79 etc
3 0
3 years ago
To plan for retirement, Deandre deposits $ 318 each quarter in an annuity that pays 7.6 %% interest, compounded quarterly. Payme
maria [59]

Answer: 1040

Step-by-step explanation:

just took 65 and mutiply 65$

8 0
2 years ago
Witch expression is equivalent to
yulyashka [42]

Answer:

0

Step-by-step explanation:

if a and considered 0 whatever power they are given their value won't change

whether it 0^1 or 0^100 the answer is always 0

8 0
3 years ago
Read 2 more answers
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