Answer:
Step-by-step explanation:
We can start as expressing the number as 10x+y, where x is the 10's digit and y is the 1's digit. From here, you can set up the following equations:
10x+y=3y+6
x+y=9
You can subtract x from both sides of the second equation, and substitute the y value into the upper equation like so:
10x+(9-x)=3(9-x)+6
10x+9-x=27-3x+6
Combining like terms:
12x=24
x=2
y=7
The number is 27.
Hope this helps!
Answer:
so far he has poured 38.4 grams
Step-by-step explanation:
Answer:
d
Step-by-step explanation:
d
Answer:
A
Step-by-step explanation:
how long is the ball in the air ?
that is the same as asking : after how many seconds will the ball hit the ground (= reach the height of 0) ?
so, that means we need to find the zero solution of h(t).
at what t is h(t) = 0 ?
when at least one of the factors is 0 :
2(-2 - 4t)(2t - 5)
we have 3 factors
2 : can never be 0.
(-2 -4t) : can only be 0 for negative t, which does not make sense in our scenario (we cannot go back in time, only forward).
(2t - 5) : is 0 when 2t = 5 or t = 2.5
so, A is the right answer.
FYI : the starting height (on the hill) is given by t = 0 :
2(-2 - 0)(0 - 5) = 2×-2×-5 = 20 ft
Answer:
Who is the youngest in your family?
