MATHEMATICS MIDDLE SCHOOL

Evaluate -x2 +x–1 forx=-1

Answers

Answer 1
Answer:

Answer:

-3

Step-by-step explanation:

-x^2 +x–1

Let x = -1

- (-1)^2 + (-1) -1

- 1 -1 -1

-3
Answer 2
Answer:

Answer:

0

Step-by-step explanation:

the equation after plugging in "x" is

-(-1)*(2)+(-1)-1

then after multiplication it is

2-1-1

this becomes 0

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Which ordered pair is the solution to the system of equations?2x+y=-8x-y=-4 A.(−3, −2)B.(−1, 3)C.(1, 5)D.(−4, 0)
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What is the distance between the two numbers on the number line?-7/4, 3/8

-2 1/8
-1 3/8
1 3/8
2 1/8

Answers

Answer: - 2 1/8

Step-by-step explanation: Lets first get common denominators of 8.

-7/4 = -14/8             (-7 x 2 = -14 and 4 x 2 = 8)

-14/8 - 3/8 = -17/8 or -2 1/8

Answer:

2 1/8.

Step-by-step explanation:

That is  |-7/4| + 3/8

= 7/4 + 3/8

= `14/8 + 3/8

= 17/8

= 2 1/8.

you want to determine how many students consider math to be their favorite subject. you randomly survey 75 students. 33 students consider math their favorite subject and 42 do not. you conclude 40% of students at your school consider math to be their favorite subject. Is that valid?

Answers

No, is not valid.
33 is 44% of 75
33 ÷ 75 = 0.44
0.44 = 44%

The seventh-grade class is building target areas for a PE activity. The bases for the game will be circular in shape. The diameter of each circle is 5 feet. Approximately how many square feet of the turf need to be painted for a base circle? Use 3.14 for π and round your answer to the nearest tenth. A.15.7 square feet

B. 19.6 square feet

C. 42.8 square feet

D. 78.6 square feet

Answers

Area of a circle is πr^2.

From this, we can calculate
π*2.5^2
= π*6.25
= 19.625
= 19.6

Answer:

I did the test the answer is 19.6 square feet

Step-by-step explanation:

What is the length of the base of a right triangle with an area of 15 m² and a height of 3 m?

Answers

Ok since it is a right triangle (1/2)bh = area
(1/2)b3 = 15

b=10m

Answer:

10 :D

Step-by-step explanation:

I'm so confused can someone help me with number 4

Answers

Ok so first with a you have 
a=2 b=5 c=7
and the problems are 2a+10 and 2b+c
Well to do this we are going to right 2a+10 as 2*a+10
So now lets replace a.
and since a=2 we have 2*2+10
2*2=4+10=14
So A is 14
and now for be we have 2b+c
Lets re-write it as 2*b+c
and now replace
2*5+7
2*5=10+7=17
b is 17.
Now with the next (4)
For a it is x=7
Subtract 3x from both sides.
Subtract 5 from both sides.
x=7
and for B
x=3
Subtract 3x from both sides.
Add 10 to both sides.
Divide both sides by 4.
x=3
Hope this helps!

3.What is the capacity of the cube in milliliters?



A.
18 mL

B.
72 mL

C.
60 mL

D.
216 mL
...................................................
the lenth width and heidth are 6cm

Answers

6 x 6 x 6 = 216. thus, the answer is **D**
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