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4 years ago

If f(x)=34x+56 , what is f(12)?

Mathematics

1 answer:

svlad2 [7]4 years ago

7 0

Answer:

f(x)= 34x +56 34(12) +56=464

Step-by-step explanation:

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2(3x+7)+x=70 That it I need help

mafiozo [28]

2(3x+7)+x=70

mutiply the bracket by 2

(2)(3x)(2)(7)+x= 70

6x+14+x= 70

6x+x+14= 70 ( combine like terms)

7x+14= 70

move 14 to the other side

sign changes from +14 to -14

7x+14-14=70-14

7x= 56

divide both sides by 7

7x/7= 56/7

x=8

Answer: x= 8

4 0

3 years ago

X - 39 = -65 x = ? Please help me im to lazy to do it!

solniwko [45]

Answer:

-26

Step-by-step explanation:

x-39=-65

+39 +39

x= -65+39

x= -26

I get it I've been there lol

Hope this helps! :)

7 0

2 years ago

a student ran out of time on a multiple choice exam and randomly guess the answers for two problems each problem have four answe

katen-ka-za [31]

Answer:

The probability that he answered neither of the problems correctly is 0.0625.

Step-by-step explanation:

We are given that a student ran out of time on a multiple-choice exam and randomly guess the answers for two problems each problem have four answer choices ABCD and only one correct answer.

Let X = Number of problems correctly answered by a student.

The above situation can be represented through binomial distribution;

$P(X=r)=\binom{n}{r}\times p^{r}\times (1-p)^{n-r};x=0,1,2,3,....$

where, n = number of trials (samples) taken = 2 problems

r = number of success = neither of the problems are correct

p = probability of success which in our question is probability that

a student answer correctly, i.e; p = $\frac{1}{4}$ = 0.75.

So, X ~ Binom(n = 2, p = 0.75)

Now, the probability that he answered neither of the problems correctly is given by = P(X = 0)

P(X = 0) = $\binom{2}{0}\times 0.75^{0}\times (1-0.75)^{2-0}$

= $1 \times 1\times 0.25^{2}$

= 0.0625

6 0

4 years ago

The diameter of a circle is 16 units. What is the radius of the circle?

KIM [24]

Answer:

8 units

Step-by-step explanation:

A diameter of a circle is twice its radius.

Therefore, we do 16 / 2 = 8 units

Hope that helps!

8 0

3 years ago

Read 2 more answers

A body moves s metres in a time t seconds so that s = t3 – 3t2 + 8. Find:

aleksandr82 [10.1K]

Answer is 3t²-6t

<h3>Step-by-step Explanation:-</h3>

$s(t) = {t}^{3} - 3 {t}^{2} + 8$

Now we need to find velocity. The velocity is the first derivative of position, so let's find the derivative of s(t) :-

$s'(t) = v(t) = 3 {t}^{3 - 1} - 3 \times 2 {t}^{2 - 1}$

So,

$v(t) = 3 {t}^{2} - 6t$

Therefore, v(t) = 3t²-6t

7 0

2 years ago