Answer:
4. 
8. 
10. 
× 
= 
I've answered 4, 8 and 10 for you as you haven't provided 12, but I hope this helps!! ^-^
Answer:
1/38^8
Step-by-step explanation:
3.8 times 10 is 38
so it would be 38 to the power of -8 ( 38^-8 )
then you simplify
you have to rewrite the negative power
( you can't have negative power as numerator )
so you put it a part of the denominator
which switches the sign
hope this helps
Answer:
1176
Step-by-step explanation:
A room with dimensions 10 ft by 5 ft has an area of 50 ft².
A room with dimension 7 ft by 21 ft has an area of 147 ft².
Writing a proportion:
400 tiles / 50 ft² = x / 147 ft²
x = 1176 tiles
7. 4x+y=8 ----- first equation
(+)
-3x-y=0
_______
x = 8 ---- second equation
substitude second equation into first equation
4(8) + y = 8
32 + y = 8
y = 24
8. 2x+5y=20 ---- first equation
(-)
2x-5y =3
________
10y = 17
y = 17/10 ---- second equation
substitude second equation into first equation
2x + 5(17/10) = 20
2x + 17/2 = 20
4x + 17 = 40
4x = 23
x = 23/4
9. 3x+2y=-10 (×2) ---- first equation
2x-5y=3 (×3)
6x + 4y = - 20
(-)
6x - 15y = 9
___________
19y = - 29
y = - 29/19 ---- second equation
substitude second equation into first equation
3x + 2(-29/19) = - 10
3x - 58/19 = - 10
3x = - 132/19
x = - 44/19
