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3 years ago

What is the mean of the high temperatures, in degrees Fahrenheit, for the week? Show your work.

Mathematics

1 answer:

DiKsa [7]3 years ago

7 0

The mean is the average, so add all the numbers and divide by 7 (7 terms).

-14 is the sum, divided by 7 = -2

The mean is -2.

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Please help me with algebra part B and C. attachment below. Will mark as brainslist. 25 points.

miv72 [106K]

Answer:

C. $(-7x+60)(x+4)$

Step-by-step explanation:

Consider the expression $-7x^2+32x+240.$

First, note that

$a=-7\\ \\b=32\\ \\c=240$

Find the discriminant

$D=b^2-4ac=32^2-4\cdot (-7)\cdot 240=1,024+6,720=7,744\\ \\\sqrt{D}=\sqrt{7,744}=88$

Now,

$x_1=\dfrac{-b+\sqrt{D}}{2a}=\dfrac{-32+88}{2\cdot (-7)}=-4\\ \\x_2=\dfrac{-b-\sqrt{D}}{2a}=\dfrac{-32-88}{2\cdot (-7)}=\dfrac{60}{7}$

Write the factored form:

$-7x^2+32x+240=-7(x-(-4))\left(x-\dfrac{60}{7}\right)=(x+4)(-7x+60)$

8 0

2 years ago

Evaluate the expression when m=4 and n=48

andrew-mc [135]

What’s the expression

3 0

2 years ago

If a phone cost $224 what would it cost if there was a 7% sales tax.

Annette [7]

Answer:

$239.68

Step-by-step explanation:

Given

Cost = $224
Sales Tax = 7%

Solving

Cost w/ Tax = Cost (1 + Tax)
Cost w/ Tax = 224 (1 + 0.07)
Cost w/ Tax = 224 * 1.07
Cost w/ Tax = $239.68

5 0

2 years ago

Dana ordered 6 pizzas for her party and each pizza is sliced into quarters. She says in order to find out how many slices there

Rama09 [41]

Answer: C. 6 x 1/4

Step-by-step explanation:

hope it helps!

8 0

2 years ago

Read 2 more answers

A physics class has students. Of these, students are physics majors and students are female. Of the physics majors, are female

11Alexandr11 [23.1K]

Answer:

$P(Female\ or\ Physics) = 0.38$

Step-by-step explanation:

Given

$n = 50$ --- total

$Physics =10$

$Female= 12$

$Both = 3$

Required

$P(Female\ or\ Physics)$

This is calculated as:

$P(Female\ or\ Physics) = P(Female) + P(Physics) - P(Both)$

So, we have:

$P(Female\ or\ Physics) = \frac{Female+ Physics - Both}{n}$

$P(Female\ or\ Physics) = \frac{10+ 12- 3}{50}$

$P(Female\ or\ Physics) = \frac{19}{50}$

$P(Female\ or\ Physics) = 0.38$

5 0

3 years ago