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3 years ago

Which expression is equal to (3 x 5) x 4

Mathematics

2 answers:

andre [41]3 years ago

3 0

3 x 5 = 15

15 x 4 = 60

ryzh [129]3 years ago

3 0

Answer:

(3*5)4 (distributive property) is the equivalent.

Or 15*4 = 60.

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Find y when y = 4x - 2 and x = 4.

Andrews [41]

Substitute 4 for x.

y=4*4-2
y=16-2

y=14

3 0

4 years ago

Read 2 more answers

Arrange the equations in the correct sequence to rewrite the formula for displacement, , to find v0. In the formula, d is displa

mote1985 [20]

The formula for displacement is:
d=1/2(v0+v)t

If we multiply by 2/t we will have

2*d/t = v0+v

In order to find v0 we subtract v (the final velocity)

2*d/t - v = v0

The final result is that: v0 = 2*d/t - v

7 0

3 years ago

Write three equations whose graphs are the same line as the equation 3x+2y=7

babunello [35]

Answer: y=(-3x+7)/2
Isolate y.

2y= -3x+7

y= (-3+7)/2

Answer: x=(-2y+7)/3

Isolate x

3x=-2y+7

x=(-2y+7)/3

Answer: 6x+4y=14
Idk if that counts but multiply the whole equation by 2.

4 0

4 years ago

a rectangle is 8cm longer then it is wide, and it’s area is 153cm^2. Find the dimensions of the rectangle.

Stolb23 [73]

Answer:

Width of 9cm and length of 17cm.

Step-by-step explanation:

To calculate an area of a rectangle, use the formula A=l*w. We know the length is 8cm longer than the width. So l = 8 + w. So the area is A= (8+w)*w.

We also know the area is 153. Substitute this value for A and solve.

$153 = (8+w)(w)\\153 = 8w+w^2\\w^2+8w-153 = 0$

To solve the quadratic, use the quadratic formula:

$\frac{-b+/-\sqrt{b^2-4ac} }{2a}$

Here a=1, b=8 and c=-153.

$w=\frac{-b+/-\sqrt{b^2-4ac} }{2a} \\w=\frac{-8+/-\sqrt{8^2-4(1)(-153)} }{2(1)} \\w=\frac{-8+/-\sqrt{64+612} }{2} \\w=\frac{-8+/-\sqrt{676} }{2} \\w=\frac{-8+/-26 }{2} \\w=\frac{-8+26 }{2}=\frac{18}{2}=9 \\and\\w=\frac{-8-26 }{2} =\frac{-34}{2}=-17$

Since w=9 or w=-17, substitute this value for w in l= 8+w to find l.

l = 8+9 = 17

l=8+-17 = -9

Since length cannot be positive, it must be l=17 and w=9.

8 0

3 years ago

Solve the equation by completing the

Pie

Answer:

Does the unkown num have a pr

Step-by-step explanation:

http/answerme.cm

4 0

2 years ago