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artcher [175]
4 years ago
15

Help please?

Mathematics
1 answer:
zubka84 [21]4 years ago
6 0
13)4n-40=-14n+14
=4n+14n=14+40
=18n=54
n=54/18
n=3

14)35a-28-1=14-8a
35a+8a=14+29
43a=43
a=43/43
a=1

15)-31-4x=-5-5-25x
-4x+25x=-10+31
21x=21
x=21/21
x=1

16)38+7k=8k+32
7k-8k=32-38
-k=-8
k=-8/-1
k=8
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Jack Matthew bought a new diamond ring for $20,000. Sales tax is 5% with a 10% excise tax. The total price including taxes that
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Jack paid $ 23000 for the ring.

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\begin{array}{l}{\text { Sales tax }=5 \% \times \text { cost price }} \\\\ {\text { Sales tax }=\frac{5}{100} \times 20000=5 \times 200=1000}\end{array}

Also given that excise tax is 10%

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I need help on determining the firs expression to evaluate 5+9+10+16÷4
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