3/8 + 4/5 answer i have a test tommorow

47/40 or 1 7/40

Step-by-step explanation:  Cross multiply for the numerator and multiply the denominators for the denominator, so 3 * 5 + 4 *8/ 8*5

3

step-by-step explanation:

divide 13.5 by 9 to get the scale factor. it equals 1.5

2 * 1.5 = 3

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.