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kotykmax [81]
3 years ago
5

Please help!!!! !!!!!!!!

Mathematics
1 answer:
Darina [25.2K]3 years ago
4 0

Step-by-step explanation:

Sum of all interior angles = 900°

A+B+C+D+E+F+G=900

120+B+148+90+142+130+129=900

B=900-759

B=141°

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Step-by-step explanation:

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A pile of 55 coins, consisting of nickels and dimes, is worth $3.90. find the number of each.
Lady_Fox [76]
Answer is: 32 nickels and 23 dimes.
<span>x - number of nickels .
y -number of dimes.
two equations in two unknowns:
1) x + y = 55
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</span>nickel is a five-cent coin.
dime is a ten-cent coin.<span>
solve equation 1) for x and substitute for x in equation 2)
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4 years ago
Read 2 more answers
he American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 45 w
Sonja [21]

Answer:

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Step-by-step explanation:

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3 years ago
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3 years ago
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