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3 years ago

If f(x)=4x^2+1 and h(x)=3x+7 then f(x)*h(x) can be rewritten as

Mathematics

1 answer:

Mama L [17]3 years ago

7 0

Answer:

$12x^{3} +28x^{2} +3x + 7$

Step-by-step explanation:

Use the FOIL method...

multiply $4x^{2}$ by 3x, $4x^{2}$ by 7, 1 by 3x and 1 by 7 to find the answer

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Solve using substitution technique; -3x+y=2, 12x-4y=-8

vladimir1956 [14]

The first equation is easier to solve for y than is the 2nd: y = 3x+2. Subst. 3x+2 for y in the second equation:

12x - 4(3x+2) = -8

Expanding, 12x =12x -8 = -8

This is always true, no matter the value of x. Thus, the solution set is "all real numbers."

4 0

4 years ago

In order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estim

Sonja [21]

Answer:

Step-by-step explanation:

Given that in order to efficiently bid on a contract, a contractor wants to be 95% confident that his error is less than two hours in estimating the average time it takes to install tile flooring.

Std deviation =4.5 errors

95% confidence interval = Mean±1.96*std dev

Hence we have

$1.96(\frac{4.5}{\sqrt{n} } )$

$\sqrt{n} \geq 4.41\\n\geq 19.4481$

Sample size should be 20.

8 0

3 years ago

I need help..What’s the answer

RSB [31]

Answer:

D. 3,750

Step-by-step explanation:

Use proportions to solve:

125/500 = x/15000

Cross multiply:

125*15000 = 1,875,000

1,875,000/500 = 3,750

x = 3,750

6 0

3 years ago

Need help with Trigonometry

Masteriza [31]

Answer:

Step-by-step explanation:

using Pythagorean theory.

equate it to the hypotenus.

thus- hyp sq=adjacent sq +opposite sq

7 0

2 years ago

Emily and a friend bought two tickets to see a soccer game. Each ticket cost $8.25. The friends paid a total of $24.50, which in

solniwko [45]

$2\cdot8.25=16.5\\\\24.5-16.5=8\\\\8:2=4\\\\\frac{4}{8.25}\cdot100\%=\\\\\frac{400}{8.25}\%=\\\\48.48\%$

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4 years ago