The answer is x+2 b/c
a) whenever it says than it means that this part goes second.
b) a number - substitute w/ any letter
ex: x
c) put it together
two more than (_+2) a number (x) is x+2
Answer:
24
Step-by-step explanation:
<u>First, we round the fractions. </u>
If a fraction is half or more it rounds up, and if the fraction is less than half it rounds down.
7/10 is greater than half so it rounds up and we add 1 to 13 to get 14.
1/8 is less than half so we round down and remove the fraction so we are left with 10.
<u>Then we add.</u>
14+10=24
I believe its 3. But i think you should wait for someone else to answer cause I might be wrong.
The event that either M1 or M2 fails has probability
by the addition rule. Failure events are independent, so
so that
Denote this probability by 
. Then 
follows a geometric distribution with this parameter and has density
The expectation is 
.
Answer:
17.5
Step-by-step explanation:
as the triangles are similar, when oriented in the same direction they have the same angles, and the lengths of all sides of DEF are the lengths of the sides of ABC but multiplied by the same scaling factor f for all sides.
so, we see that
A ~ D
B ~ E
C ~ F
and therefore
AB ~ DE
BC ~ EF
CA ~ FD
that means
DE = AB × f
EF = BC × f
FD = CA × f
we know DE and AB.
so,
4 = 10 × f
f = 4/10 = 2/5
and now we know
EF = 7 = BC × f
BC = 7/f = (7/1) / (2/5) = (5×7)/(2×1) = 35/2 = 17.5
