3 years ago

You earned a 84% on a science test. You

Mathematics

1 answer:

Vlada [557]3 years ago

6 0

84/100 = 21/?
(100 * 21)/84 = 25
There were 25 questions on the test.

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The length of a square is 2x+3. write and simplify an expression for the perimeter of the square

Archy [21]

A square has 4 equall side so if one side is 2x+3

then:
the perimeter is 2x+3 + 2x+3 + 2x+3 + 2x+3

Combine like terms and the answer is:
8x+12

7 0

4 years ago

|13x-4|+12 < 56 Anybody know this cuz I do

Ronch [10]

Answer:

$\displaystyle x\in \left(-\frac{40}{13},\frac{48}{13}\right)$

Step-by-step explanation:

Inequalities with Absolute Value

We must recall the following rule:

$\text{If }|M|0$

Then:

$-N$

We have the following inequality:

$|13x-4|+12 < 56$

Subtracting 12:

$|13x-4|< 56-12$

$|13x-4|< 44$

Applying the rule:

$-44$

Adding 4:

$-44+4$

Operating:

$-40$

Dividing by 13:

$\displaystyle -\frac{40}{13}$

The solution expressed in interval form is:

$\boxed{\displaystyle x\in \left(-\frac{40}{13},\frac{48}{13}\right)}$

8 0

3 years ago

4 3 10 x 2.43 = 10x2++ 10 100 100)

ratelena [41]

Answer:

add my sc = bmic ava, no spaces

or add my discord = XoXo_ava

Step-by-step explanation:

hope i can help bbg / bbb :

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5 0

3 years ago

Verify each identity: (tanx+tany)/(1-tanxtany)=(sinxcosy+cosxsiny)/(cosxcosy-sinxsiny),

Lapatulllka [165]

Solution:
(tanx + tany)/(1-tanxtany) is equal to the formula of tan(x+y)
sinxcosy + cosxsiny = is equal to the formula of sin(x+y)formula
cosxcosy - sinxsiny) = is equal to the formula of cos(x+y)

So this means that
tan(x+y) = sin(x+y)/cos(x+y)

8 0

3 years ago

Are the pair of lines parallel, perpendicular or neither? 8x-4y=12 and 4x-y=-15

Orlov [11]

Answer:

neither, would technically be intersecting lines tho

Step-by-step explanation:

6 0

3 years ago