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3 years ago

Plz help it would mean a lot

Mathematics

1 answer:

Volgvan3 years ago

8 0

Answer:

643663

Step-by-step explanation:

b = d

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Factor 2m2 - m - 21

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Step-by-step explanation:

hello:

2m² - m - 21

∆ =b²-4ac a=2 and b= -1 and c= -21

∆ =(-1)²-4(2)(-21)=169 = 13²

m1 = (-b+√∆)/2a = (1+13)4 = 14/4 = 7/2

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4 years ago

Multiply (2.5x10^-10) (7x10^-6)

serious [3.7K]

We want to multiply $2.5\cdot10^{-10}$ by $7\cdot10^{-6}$ .

The numbers are written in scientific notation. So we expect the answer also to be in scientific notation.

the multiplication of the 10's, using the exponents rule is :

$10^{-10}\cdot 10^{-6}=10^{-10+(-6)}=10^{-10-6}=10^{-16}$

the multiplication of the other 2 numbers is:

$2.5\cdot7=17.5=1.75\cdot10$

(we write the number so that it has only one digit to the left of the decimal point).

Thus,

$(2.5\cdot10^{-10})\cdot(7\cdot10^{-6})=1.75\cdot10\cdot10^{-16}=1.75\cdot10^{-15}$

Answer: $1.75\cdot10^{-15}$

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