Four times a number x equals 4x.
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So let us say that 3 is your number and 4x is your number and the variable. 4x is like 4 times x so 3 times 4 times x so the answer is 12x. This works with every number.
19.5 x 4
Raising a number to a positive integer power is pretty straightforward. Take the number and multiply it by itself a number of times. So 4² = 4 x 4 = 16. It is taken 2 times then multiplied. 4³ = 4 x 4 x 4 = 64. The number is taken 3 times and multiplied. This is also called 4 cubed or 4 raised to the third power. 4 raised to the fourth power is 4^4 = 4 x 4 x 4 x 4 = 256. The carat symbol [^] is often used to designate raising to a power.
Let the number be x:- x-(25*4) = 63 x-100 = 63 x = 63+100 x = 163
4 x 20 = 80