A. rhian measures the height of one of her tomato plants as 20cm. the next week it is 15% taller. what is it's new height? b. another tomato plant grows from 240cm to 312cm. calculate the percentage change in height. answer this quickly

Here is your answers:

Question one:

100% + 15% = 115%

Using the following formula:

(115%)(n)=20cm

Change the percent sign to 0.01 and solve:

115(0.01)(n)=20cm
1.15n=20cm
n= 20cm÷1.15
=17.3913043

Question two:

240cm to 312cm
312-240=72
72 difference 
100%÷72
It would be a 30% increase in height:
=30%

Hope this helps!

Number nine is f(x)= 40x : ) hoped i ya