False, 4-2(3+7) = -16 and 4-2•3+2•7= 12
Y = 4x
hope that helps
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There are 47 dimes and 23 quarters.
Step-by-step explanation:
Total amount = $10.45 = 10.45*100 = 1045 cents
Total coins = 70
1 dime = 10 cents
1 quarter = 25 cents
Let,
Dimes = x
Quarters = y
According to given statement;
x+y=70 Eqn 1
10x+25y=1045 Eqn 2
Multiplying Eqn 1 by 10;

Subtracting Eqn 3 from Eqn 2

Dividing both sides by 15;

Putting y=23 in Eqn 1

There are 47 dimes and 23 quarters.
Keywords: linear equations, subtraction
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The answer is about 240 more headbands than Suzie. The exact answer is 241! :)
If they are similar, their sides are proportional. The scale factor would be 20/28, which is 5/7.
5/7 = 3x/4x+2
Cross multiply
20x+10 = 21x
subtract 20x on both sides
10 = x
x = 10