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4 years ago

Solve for x to the nearest tenth ? x2 + x - 5 = 0

Mathematics

1 answer:

Verizon [17]4 years ago

6 0

1.79 and -2.79

When solving by x

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13 cans of paint with 5/6 liters of paint in each were used to paint 4 identical cars. How can you calculate the amount of paint

brilliants [131]

Answer:

(B) 5/6 ·13÷4

(D) 5/6 · 13/4

Step-by-step explanation:

Amount of paint per can = $\frac{5}{6}$ liters.

Number of cans used to paint 4 cars = 13

Total amount of paint used for 4 cars = $13 * \frac{5}{6}$ liters.

= $\frac{13 * 5}{6}$ liters.

= $\frac{65}{6}$ liters.

Total amount of paint used for 1 car = $\frac{65}{6} \div 4$ liters.

= $\frac{65}{24}$ liters.

Of the given options, option B,C and D correspond to the same value.

3 0

3 years ago

Suppose that you want to test the effects of different dishwashing detergents on dishes that have food stuck to them. To test th

Inga [223]

the dependent variable, as its name says it depends on the other variable

and the independent variable is the one that we can control or vary

the independent variable is the detergent because it is what we change or vary

and the dependent variable is the effect of the detergent since that is what we get

6 0

2 years ago

A fire department in a rural county reports that its response time to fires is approximatelyNormally distributed with a mean of

____ [38]

Answer:

Option C) 0.25

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 22 minutes

Standard Deviation, σ = 11.9 minutes

We are given that the distribution of response time is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

P(response times is over 30 minutes)

P(x > 30)

$P( x > 30) = P( z > \displaystyle\frac{30 - 22}{11.9}) = P(z > 0.6722)$

$= 1 - P(z \leq 0.6722)$

Calculation the value from standard normal z table, we have,

$P(x > 30) = 1 - 0.749= 0.251 = 25.1\%$

Thus, the correct answer is

Option C) 0.25

3 0

3 years ago

Read 2 more answers

If f (x) = mx+c, f(4) = 11 and f (5)=13 find value of m and c

inysia [295]

m=2 and c=3

see the attachment for the detailed solution

8 0

3 years ago

Which expression is equivalent to the expression shown?

Gwar [14]

Answer:

=7x

Step-by-step explanation:

5 0

3 years ago