Answer:
x= -8 , y = 5
x= 25/4 , y = 1/4
Step-by-step explanation:
substitute first eqn into the second eqn:
(7 - 3y)^2 -y^2 = 39
49 - 42y + 9y^2 - y^2 = 39
8y^2 - 42y +10 =0
4y^2 - 21y + 5 = 0
(4y-1) (y-5) = 0
y= 1/4 , 5
when y=1/4
x = 7- 3/4
=25/4
when y= 5
x = 7- 15
= -8
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?
Answer:
a). The first set; 2 by 6 by 6 inches
b). The second; 8 by 3 by 3 inches
Step-by-step explanation:
Step 1: Determine the formula of the volume
Volume=length×width×height
Step 2: Assume one width
Use width=2 inches, and solve for length and height
Step 3: Substitute
width=2 inches
length=height=x
volume=72 cubic inches
72=2×x²
x²=72/2=36
x=√36=6 inches
The first set; 2 by 6 by 6 inches
Step 3: Assume the length
Assume length=8 inches
width=height=y
volume=72
replacing;
72=8×y²
y²=72/8=9
y=√9=3
The second set of measurement is 8 by 3 by 3 inches
The correct answer would be $204.80 because if she keeps doubling whats in the bank the amount after the $ .20 then it would be doubled to $ .40 and so on
Answer:
Step-by-step explanation: