3 years ago

How many millimetres are there in fifteen centimetres

Mathematics

2 answers:

Anika [276]3 years ago

8 0

150 (in one centimeter there is 10 millimeters multiply 10 times 15 you get 150)

Anastaziya [24]3 years ago

3 0

<span>When solving a question like this, with two quantities and their different units (centimetres and millimetres in this case) you can begin by converting the values to the same units. this makes the calculations easier.

15 centimeters to millimeters = 15 x 100 ( because 1 cm has 100mm)

There are 1500 mm in 15 centimetres.</span>

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X = -2y + 300 3y = 800 - 4x

devlian [24]

Answer:

Step-by-step explanation:

$\left\{\begin{array}{ccc}x=-2y+300&(1)\\3y=800-4x&(2)\end{array}\right\\\\\text{Substitute (1) to (2):}\\\\3y=800-4(-2y+300)\qquad\text{use the distributive property:}\ a(b+c)=ab+ac\\\\3y=800+(-4)(-2y)+(-4)(300)\\\\3y=800+8y-1200\\\\3y=8y-400\qquad\text{subtract}\ 8y\ \text{from both sides}\\\\-5y=-400\qquad\text{divide both sides by (-5)}\\\\y=80\\\\\text{Put it to (1):}\\\\x=-2(80)+300\\\\x=-160+300\\\\x=140$