Answer:
3
Step-by-step explanation:
3 quarters + 2 dimes + 1 nickel = 1 dollar
6 dimes + 8 nickels = 1 dollar
7 nickels + 2 quarters + 1 dime = 1 dollar
I think that is all, I hope this helps!
X = 6 cos(t)
y = 3 sin(t)
we can rewrite these equations as:

Taking squares of both equations we get:

Adding both the equations, we get:
Answer:
set mary is x years old, and helen is y years old.
first sentence:x=2y
second one:4(y-8)=x+4
bring x=2y in 4(y-8)=x+4
=>4y-32=2y+4
=>2y=36
=>y=18
=>x=36
mary:36
helen:18
X^2 - 8x-9=0
D = b^2- 4*a*c = 64- 4* (-9) = 64+36=100 =10^2
X1 = (8-10)/2 = -1
X2= (8+10)/2= 9
Answer:
d
Step-by-step explanation: