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Law Incorporation [45]
3 years ago
7

Individuals with hiv sometimes contract secondary infections that are rare in the rest of the population. this is because people

with hiv
a.are unable to fight off these secondary disease-causing organisms.
b.are more frequently exposed to these secondary disease-causing organisms.
c.release hormones that attract the secondary disease-causing organisms.
d.release substances that increase the strength of the secondary disease-causing organisms.
Mathematics
1 answer:
lakkis [162]3 years ago
6 0
A because people who have HIV have a weak immune system since there are less white blood cells because HIV affects the count and white blood cells help fight off infections.
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Answer: if there had been no current, the rate would have been 4 km/hr.

The rate of the current is 1.5km/hr

Step-by-step explanation:

Let x represent the speed of the boat in still water.

Let y represent the speed of the current.

Impeded by the current the outing club took 4 hours and 24 minutes(4 + 24/60 = 4.4 hours) to paddle 11 km up the exeter river to their campsite last weekend. This means that the total speed with which they travelled is (x - y) km/h

Distance = speed × time. Therefore

11 = 4.4(x - y)

Dividing through by 4.4, it becomes

2.5 = x - y - - - - - - - - - - -1

The next day the same current was with them and it took only 2 hours to make the return trip to campus. This means that the total speed with which they travelled is (x + y) km/h. The distance travelled is

11 = 2(x + y)

Dividing through by 2, it becomes

5.5 = x + y - - - - - - - - - - -2

Adding equation 1 to equation 2, it becomes

8 = 2x

x = 8/2 = 4

Substituting x = 4 into equation 1, it becomes

2.5 = 4 - y

y = 4 - 2.5

y = 1.5

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