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Gnom [1K]
3 years ago
10

Do you guys get how to do this one if so please comment down the answer I would appreciate it if you help out!

Mathematics
1 answer:
Stolb23 [73]3 years ago
6 0

Answer:

17

Step-by-step explanation:

81 - 8^2 =

8^2= 8 x 8 = 64

81-64 = 17

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Use the quadratic formula to solve the equation 2x^2+2x-4=0
const2013 [10]

Answer:

<h2>x = -2 or x = 1</h2>

Step-by-step explanation:

The quadratic formula for the quadratic equation ax² + bx + c = 0:

x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

2x^2+2x-4=0\qquad\text{divide both sides by 2}\\\\x^2+x-2=0

a=1,\ b=1,\ c=-2

Substitute:

x=\dfrac{-1\pm\sqrt{1^2-4(1)(-2)}}{2(1)}=\dfrac{-1\pm\sqrt{9}}{2}=\dfrac{-1\pm3}{2}\\\\x_1=\dfrac{-1-3}{2}=\dfrac{-4}{2}=-2\\\\x_2=\dfrac{-1+3}{2}=\dfrac{2}{2}=1

4 0
3 years ago
What is the product of seven and eight decreased by “x” if x =15?
jekas [21]

Answer:

0

Step-by-step explanation:

product is another word for +

decreased is another word for -

____________________________

(7 + 8) - x

so

(7+8) - 15

15 - 15

= 0

7 0
3 years ago
Read 2 more answers
Identify cosQ as a fraction and as a decimal rounded to the nearest hundredth. HELP ASAP! PLEASE!!
cluponka [151]

Answer:

Step-by-step explanation:

Cos(Q) = adjacent to Q/Hypotenuse

adjacent = 15

Hypotenuse = 17.7

Cos(Q) = 15/17.7

Cos(Q) = 0.8475

The answer is C.

D is impossible. The cos of any angle can never be more than 1.

B is  Tan(Q). They are not the same.

A is  Sin(Q)

7 0
4 years ago
The temperature went from -12°F to 18°F. How much did the temperature change
vlada-n [284]

Answer:

18 - (-12)

Step-by-step explanation:

Final temp. - Initial temp. = the change in temperature

By -12, we're indicating that is below zero (which is obvious) meaning that it is not in the "normal" scale nor in the imaginary scale of numbers. So, we can operate the following...

18 - (-12) = 30

So the temperature changed by 30 values or the temperature increased by 30 values, because the number is positive.

6 0
3 years ago
Write the roster from of<br> { x:x is a factor of 42 }​
Brrunno [24]

Answer:

the correct answer is

{2,3,6,7,14,21,}

3 0
3 years ago
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