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viva [34]
3 years ago
6

How do I change my level? It says I am in high school but I am only in middle school.

Mathematics
1 answer:
weqwewe [10]3 years ago
5 0

Answer:

go on your profile ---> edit profile----> preferences

Step-by-step explanation:

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it's a week before the maths festival a maths exhibition costa £75.40 and so far 12 have been bought. what's the total income so
motikmotik
£75.40*12= £904.80


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6 0
3 years ago
George and Paul use a metal alloy that is 18.1% copper to make jewelry. How many ounces of an alloy that is 14% copper must be m
ella [17]

Answer:

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

Step-by-step explanation:

Each ounce of the 14% copper contains 0.14 ounce of pure copper.

Each ounce of the 23% copper contains 0.23 ounce of pure copper.

Each ounce of the 18.1% copper contains 0.181 ounce of pure copper.

Use x ounces of the 14% and y ounces of the 23% to make 90 ounces of 18.1% alloy.

x+y  = 90

y = 90-x

0.14x + 0.23y = 0.181·90

0.14x + 0.23(90-x) = 16.29

0.14x + 20.7 - 0.23x = 16.29

-0.09x + 20.7 = 16.29

4.41 = 0.09x

x = 49

y = 90-x = 41

Use 49 ounces of the 14% allow and 41 ounces of the 23% alloy.

7 0
3 years ago
Can someone help me​
andrezito [222]

Answer:

your answer letter is C.

4 0
3 years ago
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Plllsssss help I’m doing test pls pls pls pls
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