what does a 9 round up to in the decimal when in the tenths place? for example if it is 30.98 and it says to round to the nearest tenths place what would the decimal be now?

the answer would end up rounding to 31. :)

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

hope this

m∠a is 90°

m∠b is 40°