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MArishka [77]
2 years ago
6

Calculate 87 more than 12

Mathematics
2 answers:
lbvjy [14]2 years ago
6 0

Answer:

99

Step-by-step explanation:

We can split this up by doing the tens and then the ones.  12 = 10 + 2, so we have 87 + 12 = 87 + 10 + 2 = 97 + 2 = 99.

OlgaM077 [116]2 years ago
3 0
The answer would be 99 hope this helps
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Simplify (3x2y)(5x3y−1)
ludmilkaskok [199]

Answer:

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Step-by-step explanation:

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2 years ago
I lost track on how to do this in high school I’m helping out my lil brother
Goryan [66]

a. -7  < |-9|

b. 2 > -2

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Write the quadratic equation whose roots are 1 and -5, and whose leading coefficient is 3.
Anna35 [415]

Step-by-step explanation:

they're is a neat little trick.

but first of all, "roots" means the 0 solutions of the equation. like

ax² + bx + c = 0

there are 2 solutions for x to make the whole expression equal 0.

these are the "roots".

now to the little trick :

when is a multiplication resulting in 0 ?

when at least one of the factors is 0.

and any quadratic expression can be written as multiplication of 2 factors. like

c(x - a)(x - b) = cx² - cax - cbx + cab

what are the "roots" or 0 points ?

either

c = 0

x - a = 0 | x = a

x - b = 0 | x = b

the leading coefficient = 3.

that means nothing else than c = 3.

root = 1 means (x - 1) is one factor.

root = -5 means (x + 5) is the other factor.

so, we have

3(x - 1)(x + 5) = 3x² + 12x - 15

and the equation is

3x² + 12x - 15 = 0

or

3x² + 12x = 15

7 0
2 years ago
15-12 + 4(3) =<br> 15-12-12<br> 15-1<br> 14
MissTica

Answer:

9

Step-by-step explanation:

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