Speed of current ------ y km/h
<span>distance with the current = 4(x+y) </span>
<span>distance against the current = 5(x-y) </span>
<span>we know that 3.5(x+y) = 70 </span>
<span>x+y = 20 </span>
<span>but 4(x+y) = 4(20) = 80 </span>
<span>then 5(x-y) = 80 </span>
<span>x-y = 16 </span>
<span>x+y=20 </span>
<span>x-y=16 </span>
<span>add them </span>
<span>2x = 36 </span>
<span>x = 18 , then y = 2 </span>
Well if the student already finished 6 problems out of 15, there are 15-6 = 9 homework questions she still has to finish.
Still needs to complete: 9.
Already finished: 6
9 : 6.
Simplified: 3 : 2
Answer:
y=2
Step-by-step explanation:
3(2+y) - y = 4 + 2(y+1)
6+y-y = 4+2y-2
6 = 2y+2
4 = 2y
2 = y
check:
3(2+2)-2 = 4+2(2+1)
12-2 = 4+6
Solution
x≤−2 and x<−5
number line for x≤−2
-2,-3,-4.....-n
<---−10-------−9------−8------−7------−6------−5-----−4-------−3------−2
number line for x<−5
-6,-7,-8.....-n
<---−10-------−9------−8------−7------−6
Answer:
-2i+8
Step-by-step explanation:
(1+i)(3-5i)
3+3i-5i-5i^2
3-2i-5(-1), because i^2=-1,
3-2i+5
-2i+3+5
-2i+8