B: Apply the distributive property to get 4x - 12=9
Just by using basic algebra you can find the answer by saying 0.25 ft every year which in a fraction would be 0.25 ft / 1 year = 15 ft / x. Cross multiply so it becomes 0.25x = 15 ft. Divide 15 ft by the 0.25 ft by bringing it to the other side of the equal sign, 15/0.25= 60 years
Short answer x = 11/3
Step OneChange 64 to a power of 4
Step TwoInclude 2x - 4 as part of your power. So far you are only working on the right side of the problem.
Step Three
The bases are the same so you can equate the powers.
2x + 6 = 4(2x - 4)
Step FourRemove the brackets on the right.
2x + 6 = 8x - 16
Step fiveCollect like terms. Begin by adding 14 to both sides.
2x + 6 + 16 = 8x Subtract 2x from both sides.
22 = 8x - 2x
22 = 6x Divide by 6
22/6 = x
x = 3.666333 or 3 2/3 or 11/3
Check
Left hand side4^(2*11/3 + 6)
4^(22/3 + 6)
4^(22/3 + 18/3)
4^(40/3)
Right Side64^(2*11/3 - 4)
64^(22/3 - 4)
64^(22/3 - 12/3)
64^(10/3) There is something we can do without figuring out what this is.
64 = 4^4
4^(4*10/3)
4^(40/3) which is the same as the left side
Answer x = 11/3 <<<<<