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crimeas [40]
3 years ago
6

Debra start a babysitting business. She purchased toys, snacks, and other supplies. She charged an hourly rate for each child. T

he expression -145 + 6y represents the profit Debra has earned from her babysitting business.
Which expression represents the total amount Debra earns from babysitting?

A. 6y

B.6

C.-145

D.y
Mathematics
1 answer:
Ghella [55]3 years ago
8 0

Answer:

A. 6y

Step-by-step explanation:

The profit formula is: total earnings- total expenses. In this case the 145 has a minus sign, which indicates that these are Debra's total expenses. Then, 6y represents total revenue. You can also identify that this is the answer because revenues depend on babysitting hours, which in this case, is represented by the variable "y".

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Determine the number of roots, using the most efficient method possible.
Dmitry [639]

Answer:

2 roots in every case, not all are real.

Step-by-step explanation:

All of these equations are quadratic equations (degree 2). Every quadratic has two roots. They may be identical (looks like 1 root), and they may be complex (zero real roots), but there are always 2 of them.

a) the y-value of the vertex is negative and the parabola opens downward (leading coefficient -5), so there are no real zeros and both roots are complex.

b) each binomial factor contributes a root. Both roots are real.

c) the discriminant is positive, (3²-4·2·1=1), so both roots are real.

7 0
3 years ago
A regular heptagon has sides measuring 26 mm and is divided into 7 congruent triangles. Each triangle has a height of 27 mm. Wha
Inessa [10]
567 square mm
because 27*7 is 189 an times 3 because each side has 3 sides so it equals to 567 square mm! :)

8 0
3 years ago
Find the values of the variables. Show your work and explain your steps. The diagram is not to scale.
ivanzaharov [21]
W = 59
x = 121
y = 59
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4 0
4 years ago
Solve for x<br> -4(-5x+2)-3x-5=-30
valentina_108 [34]

Answer:

x=-1

Step-by-step explanation:

-4(-5x+2)-3x-5=-30

open the bracket

+20x-8-3x-5=-30

collect like terms

20x-3x-8-5=-30

17x=-30+13

17x= - 17

divide both sides by 17

x= -1

5 0
3 years ago
Read 2 more answers
If f(x) = x2 – 2x, find:<br> f(-3) = [?]
allsm [11]

Answer:

\boxed{\sf f(-3) = 9}

Given:

\sf f(x) =  {x}^{2}  - 2x

To Find:

Value of f(x) when x = -3

Step-by-step explanation:

\sf \implies f(x) =  {x}^{2}  - 2x \\  \\  \sf \implies f( - 3) =  {( - 3)}^{2}  - 2 ( - 3) \\  \\  \sf \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  = 3 - ( - 6) \\  \\  \sf \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  =3 + 6 \\  \\  \sf \:  \:  \:  \:  \:  \:   \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  =9

5 0
3 years ago
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