Answer:
0,-14
Step-by-step explanation:
5(x+7)²=245
divide both sides by 5
(x+7)²=49
Taking the square root of both sides
x+7=±7
Either x+7=7
subtract 7 from both sides
x+7-7=7-7
x=0
or
x+7=-7
subtract 7 from both sides
x+7-7=-7-7
x=-14
Answer:
B) Similarities
B) vestigal trait
A)DNA
Step-by-step explanation:
I'm really bad at math so can you help me with that
Answer:
![58.8\ mm^2](https://tex.z-dn.net/?f=58.8%5C%20mm%5E2)
Step-by-step explanation:
we know that
The area of the figure is equal to the area of rectangle plus the area of semicircle
step 1
Find the area of rectangle
The area of rectangle is equal to
![A=bh](https://tex.z-dn.net/?f=A%3Dbh)
where
![b=9\ mm\\h=3\ mm](https://tex.z-dn.net/?f=b%3D9%5C%20mm%5C%5Ch%3D3%5C%20mm)
substitute
![A=(9)(3)=27\ mm^2](https://tex.z-dn.net/?f=A%3D%289%29%283%29%3D27%5C%20mm%5E2)
step 2
Find the area of semicircle
The area of semicircle is equal to
![A=\frac{1}{2}\pi r^{2}](https://tex.z-dn.net/?f=A%3D%5Cfrac%7B1%7D%7B2%7D%5Cpi%20r%5E%7B2%7D)
we have
---> the radius is half the diameter
![\pi =3.14](https://tex.z-dn.net/?f=%5Cpi%20%3D3.14)
substitute
![A=\frac{1}{2}(3.14) (4.5)^{2}](https://tex.z-dn.net/?f=A%3D%5Cfrac%7B1%7D%7B2%7D%283.14%29%20%284.5%29%5E%7B2%7D)
![A=31.8\ mm^2](https://tex.z-dn.net/?f=A%3D31.8%5C%20mm%5E2)
step 3
Find the area of the figure
![A=27+31.8=58.8\ mm^2](https://tex.z-dn.net/?f=A%3D27%2B31.8%3D58.8%5C%20mm%5E2)
Answer:
5
Step-by-step explanation:
→ Let x = √20 + √20 .....
x
→ Square both sides
x² = 20 + √20 +√20 + √20
→ Replace √20 +√20 + √20 with x
x² = 20 + x
→ Move everything to the left hand side
x² - 20 - x = 0
→ Factorise
( x + 4 ) ( x - 5 )
→ Solve
x = -4 , 5
→ Discard negative result
x = 5