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3 years ago

I don’t understand this can someone help? Please

Mathematics

2 answers:

Kobotan [32]3 years ago

7 0

Answer:mkay, also yes he did

Step-by-step explanation:

1.Remove the parentheses

2.put -5z and 4z together which makes -9z(negative plus positive equals negative)

3.-9z+ -6z=-3z and 7+8=15

4.15 decided by -3=5

so yes, z=-5

oksano4ka [1.4K]3 years ago

7 0

i think the answer is 1-6x

Step-by-step explanation:

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Help me solve this problem please

chubhunter [2.5K]

10^2+8^2-7^2/(2*10*8)

= 115/160 = 0.71875 round off to 0.72

5 0

3 years ago

Solve the following system. x 2 - y = 3 x - y = -3 The solution set

Tpy6a [65]

Hello :
<span>x²- y = 3 ...(1)
x - y = -3 ...(2)
by (2) : y = x+3
subqct in (1) : x²-x-3 = 3
x²-x-6 =0
(x+2)(x-3) = 0
x+2 =0 or x-3 =0
x=-2 or x=3
if x = -2 y = -2+3 = 1
if x=3 y =3+3 = 6
two solutions : ( -2, 1) , (3,6)</span>

8 0

4 years ago

The perimeter of the cover of a math textbook is 34 inches. if the width of the cover is 7 inches, what is the length of the cov

Sauron [17]

The length would be 10 inches.
to find perimeter, you add length+length+width+width.
since both widths and both lengths have to be the same, u add the width 2 times or 7+7=14.
next u subtract 14 from 34 or 34-14=20.
since u still have 2 lengths that are equal, u divide 20 by 2 or 20/2=10

hope this helps! :)

7 0

3 years ago

4. determine whether the relation is a function(

mixas84 [53]

Answer:

No, bacause each X (first value), need to have just once Y value (second one). Here you have two values for 3 (4 and 4)

6 0

3 years ago

John recorded the number of cars passing a traffic signal at intervals of 2 minutes.

Sedaia [141]

The image relating to the question can be found in the picture attached below.

Answer:

y - intercept = 0

Slope of line = 2.86

Step-by-step explanation:

THE y-intercept is the point on the y - axis where the line crosses the y - axis. The y-intercept of the graph is 0.

The slope of the line is the ratio of change in the y-axis to the x - axis.

Gradient / slope = Δy / Δx = (y2 - y1) / (x2 - x1)

Drawing a right angle triangle at any point on to meet the line of best fit :

y2 = 35, y1 = 15, x2 = 12, x1 = 5

Slope = (y2 - y1) / (x2 - x1) = (35 - 15) / (12 - 5)

Slope = 20 / 7 = 2.857

Slope = 2.86

6 0

4 years ago