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8_murik_8 [283]

3 years ago

15

Help please it is math

1 answer:

Rasek [7]3 years ago

5 0

B is incorrect. I may be using the wrong word, but addition and multiplication are commutative, so the numbers can be added in any order or multiplied in any order and you’d still get the same sum or product. However, you can’t do this with subtraction or division as the difference or quotient will be different.

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The perimeter of the triangle is 30 cm.

Paraphin [41]

Answer:

25

Step-by-step explanation:

3a=30... equation 1

2a+2b=30... equation2

equation 2 => a+b=15 ... equation 3

equation 1 => a = 10 ... equation 4

equation 4 & equation 3 => b = 5

5^2 = 25

4 0

3 years ago

Read 2 more answers

Determine all values of k for which the roots of the equation x^2-6x+k=0 are complex

MaRussiya [10]

Complex roots occur when b^2 - 4ac is negative.

So we have (-6)^2 - 4.1.k < 0
-4k < - 36
k > 9

6 0

3 years ago

How can you find the area of a rectangle if you forgot the formula

rodikova [14]

Answer:

The area of a rectangle can be found by multiplying it's length by the height of the rectangle.

Step-by-step explanation:

5 0

3 years ago

Read 2 more answers

PleAsee help me solve this

torisob [31]

Answer:

1st blank: 1

2nd blank: -3

Step-by-step explanation:

$Y_{2} - Y_{1} / X_{2} - X_{1}$

1 - 2 / 4 - 5

-1/-1

slope = 1

1 = 4 + b

-3 = b

2 = 5 + b

-3 = b

hope this helps :)

4 0

3 years ago

What is 4x+2(3x7)= if x=5

Sedbober [7]

$4x + 2(3\cdot7) = ?$

Now we must solve this equation if x = 5. To do so we must substitute:

$4(5)+2(3\cdot7)\\$

Using PEMDAS we will solve for the parenthesis first.

$4(5)+2(21)$

Multiply:

$20+(42)$

Add:

$20+42=62$

Final answer: 62

4 0

3 years ago