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

answer:   expression= p+p*d%

price reduction + sale price = $625

sale price: $p+$p*d%

where d% is the percentage of discount

step-by-step explanation:

original price = p

price went down by $150 price reduction $p*d%

sale price= $ 475

therefore the price before sale is: $625

and the expression that shows the price before sale is: p+p*d%

d. you cannot tell because there are no values shown.