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1.if 4 x + 35= 49.8, then 7 x=?
2.a Farmer wants to paint his water storage tank. the dimensions are 14 ft. by 10 ft Which equation could he use to find the total surface area of the side and top?
A. SA=140(PIE SIGN)
b.SA=189(pIE SIGN
c.SA=238(PIE SIGN)
d.SA=336(PIE SIGN)

2006-09-10 18:18:54 · 5 answers · asked by 123 1 in Science & Mathematics Mathematics

5 answers

#1. With this and your other math problemo, use the same operation on both sides of the equation to get the variable x all by itself on one side of the equation. Then the other side will tell you what x is equal to. So:

4x + 35 = 49.8 take away 35 from both sides

4x = (49.8 - 35) = 14.8 Now, divide both sides by 4

x = 14.8/4 = 3.7

The problem asks you to tell what is 7x, it is:

7 x 3.7 = 25.9 Ta daa!

#2. We have to assume that the tank is a cylinder and we need to find the area. There are 2 parts to the area. One is the top which is a circle, the other one is the wall of the tank.

The area of a circle is (pi/4)*d^2 where d is the diameter of the circle.
The area of the wall of a cylinder is (pi)*d*h wherre d is the diameter and h is the height.

You didn't say if the 14 or the 10 was the diameter, so let's try 10 as the diameter.

The top of the tank then has area (pi/4)*10^2 = 25(pi)
The side has area (pi)*10*14 = 140(pi)
and the total is 165(pi). Oops that is not one of the given answers, so let's try the other combination.

If the diameter is 14 feet, then the tank top has area
(pi/4)*14^2= 49(pi).
and the side has area (pi)*10*14 = 140(pi)
together (49 +140)(pi) = 189(pi).

2006-09-10 18:35:33 · answer #1 · answered by Samienela 3 · 0 0

4 X + 35 = 49.8
(=) 4 X = 14.8
(=) X = 3.7

So 7X = 25.9

Diameter is 14 ft
Height is 10 ft

Diameter is 2 r
so r = 7 ft

SA of the top = pie * r^2
(=) pie * 7^2
(=) 49 * pie

SA of the side = width * length
(=) (Diameter*pie) * 10
(=) 14 * pie * 10
(=) 140 pie

Total surface area of the side and top is 140 pie + 49 pie
(=) 189 pie

2006-09-10 18:43:14 · answer #2 · answered by ooowen 3 · 0 0

1.
subtract 35 from both sides, then
4x = 14.8
divide by 4, x = 3.7

7*x = 7*3.7 = 25.9

2006-09-10 18:26:46 · answer #3 · answered by dmwogan 1 · 0 0

1.)
4x + 35 = 49.8
4x = 14.8
x = 3.7

7(3.7) = 25.9

---------------------------------

2.)
Assuming his water tank is a cylinder shape

SA = 2 Pi r(r+h)
SA = 2pi * (14/2)((14/2) + 10)
SA = 2pi * 7(7 + 10)
SA = 2pi * 7(17)
SA = 2pi * 119
SA = 238pi

ANS : C.

Thats if it is wider than it is taller

2006-09-10 19:14:56 · answer #4 · answered by Sherman81 6 · 0 0

1. 25.9
2. A

2006-09-10 22:54:35 · answer #5 · answered by Carley 3 · 0 0

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