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KengaRu [80]
3 years ago
5

What value for c will make the expression a perfect square trinomial? X^2-7x+c

Mathematics
1 answer:
gavmur [86]3 years ago
6 0

Answer: c= 49/4

Step-by-step explanation:

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What is the 8th term of the geometric sequence a2 = 20 and r = 5
algol [13]

Answer:

8th term of geometric sequence is 312500

Step-by-step explanation:

 Given :  a_2=20 and common ratio (r) = 5

We have to find the 8th term of the geometric sequence whose a_2=20 and common ratio (r) = 5  

Geometric sequence is a sequence of numbers in which next term is found by multiplying by a constant called the common ratio (r).

     a_n=ar^{n-1}  ......(1)

where  a_n  is nth term and a is first term.

For given sequence

a can be find using  a_2=20 and r =  5

Substitute in (1) , we get,

a_2=ar^{2-1}

\Rightarrow 20=a(5)  

\Rightarrow a=4

Thus, 8th term of the sequence denoted as  a_8

Substitute n= 8 in (1) ,  we get,

a_8=ar^{8-1} \\\\a_8=(4)r_{7} \\\\a_8=4(5)^7=4 \times 78125=312500

Thus 8th term of geometric sequence is 312500

8 0
3 years ago
If books cost $3.50 each, how much will 3 books cost in all?
Tamiku [17]

Answer:

3.50*3=10.5

the total will be $10.50

Step-by-step explanation:

4 0
3 years ago
A box of cereal contains 512 grams of sugar
sasho [114]
Then? You didn't type the full question
3 0
3 years ago
This is subtracting fractions what is 2/3 - 7/12???
Kitty [74]

Answer:

the answer is 0.083

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Evaluate the exponent expression 3x–4 ⋅ xy2 for x = –1 and y = 2.
ddd [48]

Answer:

48

Step-by-step explanation:

Given,

x = - 1

y = 2

To find : The value of 3x - 4 ⋅ xy² ?

Substitute the given values of x and y in the expression 3x - 4 ⋅ xy².

3x - 4 ⋅ xy²

= 3 ( - 1 ) - 4 ⋅ ( - 1 ) ( 2 )²

= - 3 - 4 ⋅ - 1 ( 4 )

= - 12 ⋅ - 4

= 48

Note : -

When a negative number gets multiplied with a negative, the resulted number is a positive number.

8 0
3 years ago
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