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Wittaler [7]
3 years ago
6

Find the product of (7x-3)(2x 4)

Mathematics
1 answer:
boyakko [2]3 years ago
5 0
What's the operation between 2x and 4
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Eli and Samantha work at a dry cleaners ironing shirts. Eli can iron 20 shirts per hour, and Samantha can iron 35 shirts per hou
Tomtit [17]

Answer:

see the explanation

Step-by-step explanation:

Let

x ----> the number of hours Eli worked

y ----> the number of hours Samantha worked

we know that

Eli and they ironed 400 shirts between them

so

20x+35y=400 -----> equation A

Samantha worked 2 more hours than Eli

so

y=x+2 ----> equation B

solve the system by substitution

substitute equation B in equation A

20x+35(x+2)=400

solve for x

20x+35x+70=400\\55x=330\\x=6

Find the value of y

substitute the value of x in equation B

y=6+2=8

therefore

The number of hours Eli worked was 6 and the number of hours Samantha worked was 8

8 0
3 years ago
Y varies directly as x, if y=9 x=3 find x when y=-27
jonny [76]

Answer:

x = -9

Step-by-step explanation:

Standard equation of direct variation:

y = kx

We need to find k.

We use the given point.

When x = 3, y = 9.

9 = k * 3

k = 3

Our equation is

y = 3x

Now we find x when y = -27.

y = 3x

-27 = 3x

x = -9

4 0
3 years ago
The volume v, measured in mm3, of an object can be calculated by v=4πr353, where r is the radius of the object. if the radius is
satela [25.4K]

Since the volume of an object = \frac{4}{3}\times \Pi r^{3}

Volume= \frac{4}{3}\times (3.14) (243)^{3}

Volume= 60074091 mm^{3}

8 0
3 years ago
Number 1 d pleaseeeeee
PIT_PIT [208]
Find 25 seconds in the table. That's between 20 and 30, right? So, find the median between 19 and 28:
19 + 28
----------   = 23.5
      2

That is around 24 deep knee squats per 25 seconds. Now, use the same method for 65 seconds:

51 + 58
----------  = 54.5
     2

That is around 55 deep knee squats per 65 seconds.
Now, explain the method using words. You might wanna use the words "average" or "mean" to describe that process above. 
7 0
3 years ago
What is the circumference of a circle with a diameter of 50 mm?
Doss [256]
157.1 mm

C x d
3.14 x 50
3 0
3 years ago
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