I need help answering this question ,

B

Step-by-step explanation: The best way to solve is to use the vertex formula -b/2a to find the x-value of the vertex and then plug that value into the equation to find the y-value, then finding the graph that best suits that vertex. In this case, -b/2a would be -(-2)/ 2(-2) or 2/-4 or -1/2. Since we now know that the x-value of the vertex is -1/2, we know the answer is now narrowed down to A and B. Now, lets plug -1/2 into the equation to find the y.

>-2(-1/2)^2 -2(-1/2) +4

>-2(1/4) +1+4

>-1/2+5

= 4.5

Answer B seems to have the vertex of (-0.5, 4.5)

answer: idk

step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.