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MArishka [77]
3 years ago
9

Write the number 679 correct to the nearest 10.

Mathematics
2 answers:
Andrews [41]3 years ago
8 0
680, 68000,750, 1800,58000, 600000. Not really sure about the fourth one though
Ber [7]3 years ago
4 0
680
67910
800
1800
58000
5990000
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On his outward journey, Ali travelled at a speed of s km/h for 2.5 hours. On his return journey, he increased his speed by 4 km/
den301095 [7]

Answer:

3.08 km/h.

Step-by-step explanation:

We know that,

Speed=\dfrac{Distance}{Time}

Ali traveled at a speed of s km/h for 2.5 hours.

Let d be the distance and t be the time.

2.5=\dfrac{d}{t}

2.5t=d      ...(1)

On his return journey, he increased his speed by 4 km/h and saved 15 minutes. So, distance is d and times is t-15.

4=\dfrac{d}{t-15}

4(t-15)=d      ...(2)

From (1) and (2), we get

4(t-15)=2.5t

4t-60-2.5t=0

1.5t=60

t=40

Put t=40 in (1).

d=2.5(40)=100

So, t=40 and d=100.

Now,

Total distance = d + d = 100 + 100 = 200

Total time = t + t - 15 = 40 + 40 - 15 = 65

So, the average speed is

\text{Average speed}=\dfrac{\text{Total distance}}{\text{Total time}}

\text{Average speed}=\dfrac{200}{65}

\text{Average speed}\approx 3.08

Therefore, the average speed is 3.08 km/h.

3 0
3 years ago
What is equivalent to<br>x2+ 14x = -13​
postnew [5]

Answer:

X= 1 AND 13

Step-by-step explanation:

x2+14x = -13

by completing the square method

you add the square of half the coefficient of b to both sides

which is (14/2)^2

x^2+14x+(7^2) = -13 +(7^2)

x^2 + 7^2 = -13 + 49

x^2 + 7^2 = 36

(x + 7)^2 = 36

find the square root of both sides

(x+7) = + or - 6

x=7-6 ; 1

or

x= 7+6 ; 13

8 0
2 years ago
The 70th term of the arithmetic sequence the 70th term of the arithmetic sequence 18,34,50,...
Sedbober [7]

Answer:1122

Step-by-step explanation:

Hve to work out the general equation first by calculating the common difference-16.

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3 years ago
The given triangles are similar. Solve for x.
Maru [420]
The first one is 21.93 rounded up to 22.
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3 years ago
What are the coordinates of the midpoint of the line segment with endpoints J (-6, 3) and K (4, -2)
GarryVolchara [31]
It’s C. (-1, 0.5). you add the x coordinates and divide by two and then add the y coordinates and divide by two.
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3 years ago
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