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3 years ago

Values of an expression

Mathematics

1 answer:

REY [17]3 years ago

6 0

Substitute a number for each variable

Ex.
2x x=5
(2)(5)
=10

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What is f(–3) for f(x) = 2x2 – x + 5? A) 11 B) 17 C) 20 D) 26

nirvana33 [79]

Answer: D

Step-by-step explanation:

f(x) = 2x² - x + 5

f(-3) = 2(-3)² - (-3) + 5

= 2(9) + 3 + 5

= 18 + 3 + 5

= 26

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3 years ago

The resistance of a wire varies directly with its length and inversely with the square of its diameter. If 100 feet of wire with

DaniilM [7]

Answer:

14 ohms

Step-by-step explanation:

The resistance varies directly with length, so increasing the length by a factor will increase the resistance by the same factor.

The length of the wire increased by a factor of 1.4 from 100 ft to 140 ft. That means the resistance will increase by a factor of 1.4 from 10 ohms to 14 ohms. (The diameter did not change.)

The longer wire will have a resistance of 14 ohms.

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2 years ago

Read 2 more answers

A normal distribution has a mean of 10 and a standard deviation of 1. What is the probability of selecting a number that is at m

Len [333]

Answer: 0.500

Step-by-step explanation:

Given : A normal distribution has a mean $(\mu)$ of 10 and a standard deviation $(\sigma)$ of 1.

Let x be a random variable that represents numbers .

The probability of selecting a number that is at most 10 will be

$P(x\leq10)=P(\dfrac{x-\mu}{\sigma}\leq\dfrac{10-10}{1})\\\\=P(z\leq0)=0.500$

As the area occupied by standard normal curve less than equal to 0 = 0.500

So, required probability = 0.500

3 0

2 years ago

Find the area and perimeter of a rectangle with a length of 3x + 2 and a width of 4x + 3.

bekas [8.4K]

Answer:

170ft^2

The area is 170ft^2.

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3 years ago

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If the principal, interest rate, or time in a simple interest problem is doubled, and the other two quantities remain consta

VashaNatasha [74]

In this question we have to find the effect of doubling principal, rate or time .

First we have to check the formula which is

$I = P rt$

As we see that interest is the product of principal, rate and time. So if any of these three doubles, that is if any of these three is twice of the original value, the interest gets doubled.

SO the correct option is C.

5 0

3 years ago