Set up a system of equations.
x + y = 7
5x + 6y = 39
x + y = 7
x = -y + 7
Substitute -y + 7 into the 2nd equation for 'x':
5(-y + 7) + 6y = 39
Distribute 5:
-5y + 35 + 6y = 39
Combine like terms:
y + 35 = 39
Subtract 35 to both sides:
y = 4
Plug this into any of the two equations to get 'x'
x + y = 7
x + 4 = 7
Subtract 4 to both sides:
x = 3
So she pulled weeds for more than 1 hour 3 times.
Answer: Yellow flowers 3 1/3 And red flowers 7
Step-by-step explanation:
So you take 3 and put into 1/3. You get 3 1/3 because if you multiply them together you get 21 and there's 21 yellow flowers in total. Then for "R" (red flowers) you would divide 21 by 3 (the reason you divided it by 3 is because there's 3 times the number of red flowers.) you would get 7.
Yellow Flowers: 3 1/3
Red Flowers: 7
Answer:
w = 12.38
Step-by-step explanation:
w - 2.58 = 9.8
add 2.58 to both sides
w = 12.38
The basic idea is that multiplying by 10 just moves the decimal point one place to the right. It makes the number bigger.
Examples:
3.1 x 10 = 31
3.1 x 10 x 10 = 31 x 10 = 310
Each time you multiply by another 10, the decimal point moves one more place.
In your exercise, 
says you're going to multiply by 10 <u>three</u> times in a row. So that will move the decimal point 3 places to the right.
So what do you get if you move the decimal in 4.25 three places to the right?
