Answer: Early in the race, Alberto runs faster. He maintains a speed of 20 km/h, as Bianca running speed ??increases??. The first person to cross the finish line is Bianca.
Step-by-step explanation:
Answer:

According to the laws of indices, when multiplying numbers with exponents and the bases are the same add the powers



Answer:
The roses are sold individualy for $5.00.
Step-by-step explanation:
To find the answer, you divide 90 (the total amount) by 18 (the number of roses). Because we are doing division, you forget about the dollar sign (for now) and do the division. 90➗18=5. Since it is money, it would be $5.00
Note that 49b^2 - 256 = 0 is the difference of two squares. Thus, 49b^2 - 256 = 0 can be re-written as
(7b)^2 - 16^2 = 0, which factors into (7b+16)(7b-16)=0.
Solving for b: 7b+16=0 becomes b = -16/7, and
7b-16=0 becomes b = 16/7.
As expected, this 2nd order equation has 2 solutions.
$0.20 Because since one ribbon for one foot equals $0.10 (10 cents), you have two feet so you would have to multiply or add $0.10 and $0.10 by multiplying, you would have to multiply 10 two times which would give you 20. To add you would add 10 plus 10 and you would get yet again 30. After that you just put the form as cents which would be $0.20 :)