Δabc is reflected across the x-axis and then translated 4 units up to create δa′b′c′. what are the coordinates of the vertices of δa′b′c′ ?

changing the sign of y coordinates and then adding 4 units to them will give you translated image

Step-by-step explanation:

The translation happens in two phases. First one the reflection across x axis and the second one shifting 4 units upward

let us see them one by one.

1. Reflection along x axis.

When the triangle will be reflected along x axis, it is the y coordinates which are going to be changes

the y coordinates will now be the negative of what they were before reflection .

2. The upward shifting of the reflected image. In this process the x coordinate will again remain the same but we add 4 units to each coordinates of y in all the three vertices

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

the answer is: d) o, f, and kr.

atomic radius of bromine (br) is 114 pm.

atomic radius of oxygen (o) is 73 pm.

atomic radius of fluorine (f) is 72 pm.

atomic radius of krypron (kr) is 112 pm.

the atomic radius of a chemical element is a measure of the size of its atom.

the atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.

the atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.