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serious [3.7K]
3 years ago
11

Look at the following math problems. 10 + 2 = 12 12 − 2 = 10 What are these operations called?

Mathematics
1 answer:
Anettt [7]3 years ago
3 0

Answer:

i think it might be fact families

Step-by-step explanation:

this is because they use the 3 same #rrs

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There are 132 projects in the science fair. if 8 projects can fit in a row, how many full rows of the projects can be made? how
wel
Divide 132 by 8. You will get the quotient of 16 and the remainder of 4. So each row has 16 projects. The remaining 4 projects cannot be filled completely in a row.
4 0
3 years ago
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50 POINTS AND WILL MARK BRAINLIEST NEED HELP ASAP
trasher [3.6K]

Answer:

Please see attached image and all steps below for both parts

Step-by-step explanation:

Task 1

The following system of equations includes a linear equation and a quadratic one:

\left \{ {{y=x+2} \atop {y=x^2-8x+2}} \right} \}

it can be solved by using substitution in the second equation of the variable "y" by the linear expression of the first equation:

x+2=x^2-8x+2\\x=x^2-8x\\x^2-9x=0\\x\,(x-9)=0

and this product of two factors will e zero when either factor is zero, that is: when x = 0, or when x = 9 [to make zero the binomial(x - 9)]

There are two solutions: x = 0 and x = 9.

When we graph both expressions in the system, we see that the line intercepts the parabola at the points (0, 2) and (9, 11). See attached image.

Task 2

Part 1:

Let's pick 30 as a number larger than 25. 30 can be written as 40 - 10

So we can use:

(40 -10)^2=40^2-2\,(40)\,(10)+ 10^2=1600-800+100=900

to calculate its square.

Part 2:

let's choose a=9 and b=10 so we use:

9^3+10^3=(9 + 10)\,(9^2-(9)\,(10)+10^2)=(19)\,(81-(90)+100)=19\,(81-180+100)=19\,*\,91=1729

8 0
2 years ago
An office clerk earns $120 for two 4-hour work shifts. How much will she earn
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Answer:

$225

Step-by-step explanation:

$120 for 2 4-hour shifts, $120 in 8 hours

$15 every 1 hour

Money for 15 hours: 15 x 15 = $225

8 0
2 years ago
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I really need help with all the questions
nlexa [21]
1. 1,728

2. You can't tell because it doesn't say the amount one serving will serve, and how many servings she is serving, and how many people come to her party. Sorry!!

I hope I helped with the first one!
4 0
3 years ago
The Trapezoidal rule Tn on the interval [0,5) will be exact for
igomit [66]

Answer:

degree 1

Step-by-step explanation:

The trapezoidal rule is exact when the second derivative is zero.  This occurs when the polynomial is degree one or less

5 0
2 years ago
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