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NeX [460]
3 years ago
8

If x=15, y=3 & z=-2 what is the value of x-y _____+x ? yz

Mathematics
1 answer:
Elodia [21]3 years ago
4 0

Answer:

12

Step-by-step explanation:

From the question, the values of x, y and z are as follows.

x=15, y=3 and z= -2

Now, we are to find the value of the expression

\frac{x - y}{yz} + x

we substitute the values of x, y and z into the expression and simplify

\frac{15 - 3}{3( - 2)} + 15

=  \frac{12}{ - 6} + 15

=  - 2+ 15

= 13

Therefore, value of

\frac{x - y}{yz} + x =12

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Sunflower growth 1 week it grew 2 and va half inches in two weeks it grew 2 and 3 fourth in 3 weeks it grew 3 and one fourth how
Liula [17]

Answer:

The Growth of sunflower duing 3 weeks is 8.5 inches or 8 (1/2).

Step-by-step explanation:

Given:

Growth of sunflower each week .

To find :

Total growth during 3 weeks?

Solution:

According to given data:

Growth is

  1. 1st week=2 and 1/2 inches=5/2=2.5 inches .
  2. 2nd week =2 and 3/4 inches=11/4 inches.
  3. 3rd week=3 and 1/4 inches=13/4  inches.

Total growth is given by,

=growth of (1st week +2 week+ 3 week)

=5/2+11/4+13/4

=34/4

=17/2

=8 and 1/2 inches.

Hence the overall growth is about 17/2 or 8.5 inches in 3 weeks .

6 0
3 years ago
A lighthouse is built on an exposed reef, 4.5 miles off-shore. The shoreline is perfectly straight, and a town is located 6 mile
Alisiya [41]

Answer: 3.94 hours

Step-by-step explanation:

From the question, the following parameters are given:

Distance offshore = 4.5 miles

Distance downshore = 6 miles

Speed when running = 3.4 mph

Speed with boat = 1.8 mph

distance of boat rowing = sqrt(4.5^2 + x^2)

Where

Speed = distance/time

Time = distance/speed

Time = distance of boat rowing/1.8

distance of running = 6 - x

Time = (6-x)/3.4

total travel time

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

dt/dx = x/(1.8×sqrt(4.5^2 + x^2) - 1/3.4

d^2t/dx^2 = +ve at any x

x is at its minimum when dt/dx=0

x/(1.8×sqrt(4.5^2 + x^2) = 1/3.4

x = 6/sqrt(253) × 4.5 = 1.697 miles

Substitute x in

t = sqrt(4.5^2 + x^2)/1.8 + (6 - x)/3.4

We obtaine

t = sqrt(4.5^2 + 1.697^2)/1.8 + (6 - 1.69)/3.4

t = 2.672+ 1.266 = 3.94 hours

7 0
3 years ago
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