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EastWind [94]
3 years ago
7

What is the mean of 90, 55, 75, 60, 80, and 90?

Mathematics
2 answers:
ElenaW [278]3 years ago
8 0
90+55+75+60+80+90=450
450/6=75
Nataly [62]3 years ago
7 0
(90+55+75+60+80+90)/7=64.2857143
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A 40​-foot piece of siding is cut into three pieces so that the second piece is four times as long as the first piece and the th
xeze [42]

Answer:

4 ft , 16 ft & 20 ft

Step-by-step explanation:

40 = x + 4x + 5x = 10x --> x = 4

3 0
2 years ago
Solve the inequality 4x - 7<5
Alexandra [31]

Answer:

x ∈ (-oo ; 3)

Step-by-step explanation:

4x - 7 < 5

4x < 5 + 7

4x < 12

x < 12 : 4

x < 3

x ∈ (-oo ; 3)

8 0
3 years ago
If f(x)=-4x^2-6x-1 and g(x)=-x^2-5x+3, fine (f-g)(x)
NeX [460]

Answer:

\large\boxed{(f-g)(x)=-3x^2-x-4}

Step-by-step explanation:

(f-g)(x)=f(x)-g(x)

f(x)=-4x^2-6x-1,\ g(x)=-x^2-5x+3\\\\(f-g)(x)=(-4x^2-6x-1)-(-x^2-5x+3)\\\\(f-g)(x)=-4x^2-6x-1-(-x^2)-(-5x)-3\\\\(f-g)(x)=-4x^2-6x-1+x^2+5x-3\qquad\text{combine like terms}\\\\(f-g)(x)=(-4x^2+x^2)+(-6x+5x)+(-1-3)\\\\(f-g)(x)=-3x^2-x-4

5 0
3 years ago
I need help!<br> Its not a real question im just practicting!
Firdavs [7]

Look here in a square which is what I imagine that drawing is all the angles are 90 degrees. A rectangle would be knowing two angles is know all of them one way or another so fix your work and you should know the answer

4 0
2 years ago
Read 2 more answers
How can you find the surface area of a composite solid made up of prisms ? (Help)
sammy [17]
Oh, this is easy. For any prism, you find the surface area by finding the are of all the sides. I will post all surface area formulas here, for reference
Cube:



Surface area = 6 × a2




Right circular cylinder:



Surface area = 2 × pi × r2   +  2 × pi × r × h

pi = 3.14
h is the height
r is the radius


Rectangular prism:



Surface area = 2 × l × w  +  2 × l × h  +  2 × w × h 




l is the length
w is the width
h is the height


Sphere:



Surface area = 4 × pi × r2 

pi = 3.14
r is the radius


Right circular cone:



Surface area = pi × r2  +  pi × r ×( √(h2 + r2)) 

pi = 3.14
r is the radius
h is the height
l is the slant height 


Right square pyramid:



Surface area = s2 + 2 × s × l

s is the length of the base
h is the height
l is the slant height 
8 0
3 years ago
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