What value of b makes the trinomial below a perfect square? X^2-bx+100

a- 10
b-20
c-5
d-50

b) 20

Step-by-step explanation:

x^2-20x+100 If you factor it, it would be (x-10)^2

she played for 18.75 hours.

step-by-step explanation:

if she played 2/4 of a hour on tuesday. and there is 60 minutes in an hour and 60 divided by 4 is 7.5. and she played 2/4 of an hour on thursday then again 60 divided by 4 is 7.5, you add 7.5+7.5=56.25. now you have to do 1/4 of an hour, it equals 3.75. now you have to add them all up. 3.75+7.5+7.5=18.75

i hope this and i hope you get it right. it took me a while to get this done for you. : )

its an acute right triangle

step-by-step explanation: