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stiv31 [10]
3 years ago
14

please help!!! You buy cards to send to family and friends for their birthdays. The function y=2.5x represents the cost y of the

number of cards x you buy. Is 8 in the domain? EXPLAIN. Is 40 in the range?EXPLAIN
Mathematics
1 answer:
Talja [164]3 years ago
3 0
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Solve for d.<br> 19d -16d-d-d-1 = 12
Reika [66]

Answer:

d = 13

Step-by-step explanation:

19d - 16d - d - d - 1 = 12

19d + (-16 - 1d - 1d) - 1 = 12

19d + (--18d) - 1 = 12

19d - 18d - 1 = 12

1d = 12 + 1

d = 13

Check:

19*13 - 16*13 - 13 - 13 - 1 = 12

247 - 208 - 26 - 1 = 12

39 - 27 = 12

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3 years ago
Please help answer number 1
steposvetlana [31]
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2 years ago
Read 2 more answers
A roll of wallpaper cost £7.85 richard buy 25 rolls of wallpaper estimate
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Answer:

Step-by-step explanation:

if we're estimating ,we're going to round up to 8 since you can multiply that easier. 25 times 8 is 200 so estimation will be around 200

7 0
3 years ago
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