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Reil [10]
3 years ago
6

HELP PLEASE! Evaluate the expression when x= 4 and y = 9. 5y – 6х =

Mathematics
2 answers:
anyanavicka [17]3 years ago
4 0
It would be 21 because 5x9=45 and 6x4=24 then you subtract them
Galina-37 [17]3 years ago
3 0

Answer: 21

Step-by-step explanation:

5 x 9 - 6 x 4 = 45-25= 21

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4) A window is in the form of a rectangle surmounted by a semicircle. The rectangle is of clear glass, whereas the semicircle is
lisov135 [29]

Answer:

l=0.1401P\\

w =0.2801P

where P = perimeter

Step-by-step explanation:

Given that a window is in the form of a rectangle surmounted by a semicircle.

Perimeter of window =2l+\pid/2+w

P= 2l+3.14 (w/2)+w

Or P = 2l+2.57w\\l = \frac{P-2.57w}{2}

To allow maximum light we must have maximum area

Area = area of rectangle + area of semi circle where rectangle width = diameter of semi circle

A=lw +\pi \frac{w^2}{8}

A=lw +\pi \frac{w^2}{8}\\A=w*\frac{P-2.57w}{2}+0.3925w^2\\2A= Pw-2.57w^2+(0.785w^2)\\2A' = P-5.14w+1.57 w\\2A" =-5.14+1.57

Hence we get maximum area when i derivative is 0

i.e. P-5.14w+1.57 w=0\\3.57w =P\\w = \frac{P}{3.57} =0.2801P

l = \frac{P-2.57w}{2}\\l = 0.1401P

Dimensions can be

l=0.1401P\\w =0.2801P

5 0
3 years ago
On Monday, the rover traveled 330 cm. On Tuesday,it traveled 180 cm. If the rover stoped every 15 cm to recharge, how many more
boyakko [2]
10 more times

On Monday the rover needed to charge 22 times and on Tuesday 12 times.
So the answer is 22-12=10

3 0
3 years ago
Can someone please HELP! FOR BRAINLIEST!
RoseWind [281]

Answer:

1st pic:

step 2.

2nd pic:

Rene should add, not multiply 2 volumes.

The correct answer is 48+216 =264

3rd pic:

a, for blue prism: V = Area of base x Height = 48 x a =720

=> a = 720/48 = 15

b,  for orange prism: V = Area of base x Height = (12xb)/2 x 15 =720

=> b =(720x2)/(15x12)= 8

8 0
3 years ago
Can someone please help me with this too
Svetach [21]

Answer:

I have no idea but I suggest making the rule to round the output to the nearest tenth because all the numbers on there have a 9 at the end.

Hope I helped, if I'm right please give brainliest because I cant level up until I get 2 more ;(

<3 Enjoy,

    Dea

3 0
3 years ago
(6×1,000)+(1×100)+(2×10)+(9× 10 1 ​ )+(4× 100 1 ​ )=?
stiv31 [10]

Answer:

11033

Step-by-step explanation:

3 0
2 years ago
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