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Ipatiy [6.2K]
3 years ago
9

Luke buys 7 new pencils. Now he has 21 pencils. How many pencils did Luke have at first?

Mathematics
2 answers:
Alinara [238K]3 years ago
7 0

Answer:

21-7

14

Step-by-step explanation:

Luke had 14 pencil at first

Pani-rosa [81]3 years ago
5 0

Answer:

14

Step-by-step explanation:

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Answer:

str + stu = 180 \\ 180 - 20 = 4x \\ 160 = 4x \\ x = 40

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How much bigger is the Sum of first 50 even numbers than the sum of first 50 odd numbers?
Lunna [17]

Answer:

50

Step-by-step explanation:

Sum Even numbers

n = 50

d = 2

a1 = 2

The last number is

an = a1 + (n-1)d

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sum = 2550

Sum of the first 50 odd numbers

a1 = 1

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d = 2

l = ?

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Sum

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3 years ago
What is 625 in exponential form
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1) solve for w: 3w - 10 = 4w + 5<br> 2) solve for t:6 -2t &gt;18
Gre4nikov [31]
Problem # 1
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(3w-10) + (10-4w) = (4w+5) + (10-4w)
(3w-10) + (-4w+10) = (4w+5) + (-4w +10)
3w-10-4w+10 = 4w +5 -4w +10
3w-4w=15
-w=15
w= -15 (w is negative 15)

problem #2.
6-2t > 18
6-2t-6 > 18-6
-2t > 12 
(-1) (-2t) >  12 (-1)
2t > -12
next divide by 2
2t/2 > -12/2
 t >  -6     (t is greater then negative 6)

 
5 0
3 years ago
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