At the science museum there is an energy exhibition with 150 displays:
• 30% of the displays are about electricity
• 2 5 are about using renewable energy
• 0.2 are about the use of gas
• the remainder are about nuclear power
how many displays are there about nuclear power?

15 displays are of nuclear power

Step-by-step explanation:

We have Total of 150 displays

1. 30 percent are of electricity i.e 30% of 150 = 45

2. 2/5 are of renewable energy i.e 2/5 * 150 = 60

3. 0.2 are of gas i.e 0.2 * 150 = 30

Remainder are of nuclear power (assume x)

i.e Total no of displays = Sum of individual displays

150 = 45 + 60 + 30 + x

150 = 135 + x

15 = x

Given function:

The x-intercept is the point(s) with y = 0

The leading coefficient is positive. It mean the graph opens up. It in turn means the vertex is the lowest point.

The vertex is defined by:

Plot the vertex (-1, -9), x-intercepts (0.5, 0) and (-2.5, 0) and connect the points considering the graph opens up. You may need to add more points to the graph if need more accurate graph.