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Finger [1]
3 years ago
9

Which expression is equivalent to 7b+4b - 1b?

Mathematics
2 answers:
Marina86 [1]3 years ago
8 0
The right answer should be the third choice
Sav [38]3 years ago
4 0
Hey there,

To solve this you just combine like terms so you get 10b.

Hope I helped :)
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wel
1. 16

2. 8

3. 36

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7 0
3 years ago
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The price of a watch was increased by 20% to £162. What was the price before the increase?
mel-nik [20]

Answer:

£135

Step-by-step explanation:

Original price = 100%

Percentage increase = 20%

New price = 100% + 20% = 120%

If 120% = £162

What about 100% = ?

= (100 x 162) ÷ 120

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3 years ago
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Simplify this, include instructions
Cerrena [4.2K]
<span><span><span>3n</span>+1</span>−<span>2n</span></span>+<span>8

</span><span>Combine Like Terms:
</span>
<span><span><span>3n</span>+1</span>+<span>−<span>2n</span></span></span>+<span>8
</span>(3n+−2n)+(1+8)
=<span>n+<span>9
</span></span>
Answer is n+9


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5 0
4 years ago
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Use the rules for multiplication by powers 100 to calculate 20 x 100
Tcecarenko [31]

Multiplication by a power of 10 requires only that you add the number of zeros indicated by the power. Multiplying by 100 = 10² will add 2 zeros on the right.

... 20 × 100 = 2000

_____

Multiplying by 10⁰ will add 0 zeros on the right.

... 20 × 10⁰ = 20

6 0
3 years ago
There are 4 boys for every 10 students in Ms. Day´s math class. If there are 30 girls in her class, how many boys are there? ( w
Furkat [3]

Answer:

12

Step-by-step explanation:

4/10 x 30

Multiply

12 boys

7 0
3 years ago
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