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Trava [24]
4 years ago
15

Can someone help me with this question(will mark brainiest) thanks

Mathematics
2 answers:
Romashka [77]4 years ago
8 0

Answer:

-105

Step-by-step explanation:

plug in -7

f(-7)= -(-7)^2+8(-7)

f(-7)= -49-56

f(-7)= -105

Ket [755]4 years ago
7 0

Answer:

f(x)= -105

Step-by-step explanation: -(-7)x^{2}+(8)(-7)

=-49+(8)(-7)

=-49+-56

=-105

You might be interested in
In ∆DEF, the midpoint of the side opposite vertex D is M and the centroid is C. If DM is 6, what is DC and CM?
n200080 [17]

Answer:

DC = 4

CM = 2

Step-by-step explanation:

Remark

The centroid is located at the intersection point of all three medians of a triangle. The centroid is divides the median into a ratio of 2 to 1. The 1 is located closest to the intersection point of the median and the side opposite the vertex which is the starting point of the median.  

In this particular triangle  CM<DC

Givens

DC + CM = 6

CM <DC                  Labeled.

<em><u>Set up Proportion</u></em>

1:3 :: MC : (DC + CM)

1:3 :: MC : 6            

1/3 = MC/6              Cross Multiply

3*MC = 6                 Divide by 3

MC = 6/3                 Divide

Answer

MC = 2

DC = 6 -2 = 4

7 0
3 years ago
Is the polynomial t^4-7 in standard form?
slavikrds [6]

Answer:

no

Step-by-step explanation:

no,

it is not in the form

ax {}^{2}  + bx + c = 0

5 0
4 years ago
Read 2 more answers
I need help with all 3 questions please thank you
Zolol [24]

Answer:

see below

Step-by-step explanation:

2,4,6,8,....

The sequence is defined by

an = a1 +d(n-1)

a1 is the first term which is 2

d  is the common difference

d = 4-2 =2

an = 2 + 2(n-1)

We want the 100 term

a100 = 2 + 2(100-1)

         =2 +2(99)

         =2 +198

         = 200

Next we need to find the sum

Sn = n/2 ( 2a1 + d(n-1))

n =100

Substituting n=100, d=2 and s1 = 2

S100 = 100/2 (2*2 + 2(100-1))

         =50 (4+ 2*99)

          =50 (4+198)

          =50 (202)

          =10100

Sum of 101 odd number

n= 101 a1 =1 and d =2

S101 = 101/2 ( 2*1 + 2(101-1))

         50.5 (2+2(100))

           50.5 (202)

           10201

The sum of the first 100 even numbers is smaller than the sum of the first 101 odd numbers

7 0
4 years ago
Read 2 more answers
15 points and brainliest for CORRECT answer.
Verdich [7]
Since we know the area of ΔACD as well as the measurement of the base, we will use these to find the length of the altitude.  The formula for the area of a triangle is A=1/2bh.  Our area is 30 and our base is 10, so we have:
30=1/2(10)h
30=5h
Divide each side by 5:
30/5=5h/5
6=h
The height of the triangle is also the height of the trapezoid.  We can now find the area of the trapezoid.  The formula we need is A=1/2(B+b)h.  Substituting our numbers in, we have:
A=1/2(10+8)(6)=1/2(18)(6)=54
The area of the trapezoid is 54.
5 0
3 years ago
What is the value of x in the figure?
Ilya [14]

Answer:

according to angle sum property of triangle

74° + 66° + x = 180°

140° + x = 180°

x = 180° -140°

x = 40°

7 0
3 years ago
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