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3 years ago

How to do this question plz

Mathematics

2 answers:

Jlenok [28]3 years ago

8 0

Answer:

Step-by-step explanation:

surface area of two trapezoids=2[(12+8)/2×3]=2[30]=60 cm²

surface area of side rectangles=10×8+10×12=10(8+12)=200 cm²

surface area of top=10×5=50 cm²

surface area of bottom=10×3=30 cm²

Total surface area=60+200+50+30=340 cm²

shusha [124]3 years ago

7 0

Answer:

Step-by-step explanation:

to find the surface area , you need to find the area of each side(face)

top: 5*10=50

the bottom of the shape: 3*10=30

the front face:10*8=80

the sides are trapezoid shapes with:different dimensions:

side :8,12 and eight of 3 ( the shape has 3 faces the same)

area=((12+8)/2)*3= 30 (30*3 faces or sides)

add the numbers: 50+30+80+(30*3)=250 cm^2

I hope it is right and good luck

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A tap is filling a 10-liters tank at the speed of 5 liters per minute.

SVETLANKA909090 [29]

Answer:

It takes 2.5 minutes to fill the tank.

Explanation:

The net speed or net rate for filling the 10-liters tank is equal to the speed the tap is filling less the speed the water is leaking through the hole located at the bottom of the tank:

Net rate = rate of filling - rate of leaking

Net rate = 5 liters/minute - 1 liter/minute

Net rate = 4 liters/minute

Thus, consiedering the tank is empty at the beginning, the time is:

Time = Volume of the tank / net rate of filling

Time = 10 liters / (4liters/minute)

Time = 2.5 minutes ← answer

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3 years ago

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lana [24]

14 7/18 is the correct answer i believe.

7 0

3 years ago

Read 2 more answers

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Naddika [18.5K]

Answer:

Step-by-step explanation:

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5 0

3 years ago

What is the equation of the line that has a slope of 3 and goes through the point (-3,-5)?

azamat

Answer:

Here,

slope (m)=3

y-intercept (c)= -5

Now,

The equation of the line;

or,y=mx+c

or,y=3x-5

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4 years ago

For the function g(x)= x-9/x+7, solve the following inequality. g(x)>_0

jasenka [17]

Answer:

$x< -7 ; x\geq9$

Step-by-step explanation:

You start noticing that for x = 9 g(x) =0, and for x= -7 the function isn't defined.

That splits the number lines in 3 areas: x<-7; -7<x<9, and x>9. (notice the strict inequalities since we already discussed the breaking points.

Let's try a point in each interval, namely, since i like the values, -10, 0, 10.

$g(-10) = \frac{-10-9}{-10+7} =\frac{-19}{-3} >0\\g(0) = \frac{0-9}{0+7}=-\frac{9}{7} 0$

We have all the informations we need. The value we need are $x< -7 ; x\geq9$

3 0

2 years ago

How to do this question plz ​

How to do this question plz