Answer:
option 4
Step-by-step explanation:
Using the rule of radicals
× 
= 
Given
(2 - 5
) 3
← distribute parenthesis by 3
= 6 - 15
= 6 - 15
= 6 - 15(
× 
)
= 6 - 15(2 )
= 6 - 30
Answer:
about 8 cm
Step-by-step explanation:
The formula for the area of a regular polygon is ...
A = 1/2Pa . . . . where P is the perimeter and "a" is the apothem, the distance from the center to a side
Filling in your numbers, we have ...
20 cm^2 = (1/2)P(5 cm)
Dividing by the coefficient of P, we find ...
2×(20 cm^2)/(5 cm) = P = 8 cm
The perimeter of the pentagon is about 8 cm.
_____
<em>Comment on the problem</em>
This calculation makes use of the area formula, as apparently intended. A regular pentagon with an apothem of about 5 cm will have an area of about 90.8 cm^2. The given geometry is impossible, as the pentagon is nearly 10 cm across. It cannot have a perimeter of only 8 cm.
The answer to number 17 is c
If two sides of one triangle are congruent to two sides of another triangle then CPCTC makes it SSS
Answer:
5 batteries.
Explanation:
"How many batteries lasted more than 5 1/2 hours?" which means it's counting not only 5 1/2, but 5 3/4 and 6 1/4
