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3 years ago

If c =5 what is 4 +3c=

Mathematics

2 answers:

xenn [34]3 years ago

7 0

Answer:

Step-by-step explanation:

do 3 x 5=15

the do BIDMAS (Brackets, Indices, Division, Multiplication, Addition, Subtraction)

4+15=

snow_tiger [21]3 years ago

6 0

Answer:

Step-by-step explanation:

If c=5...

4+3c

=4+3(5)

=4+15

=19

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Tonya and Leo each bought a cell phone at the same time. The trade-in values, in dollars, of the cell phones are modeled by the

Paha777 [63]

Answer:

The answer is Tonya's phone had the greater initial trade-in value.

Leo's phone decreases at an average rate slower than the trade in value of Tonya's phone.

Step-by-step explanation:

Given

Tonya

$f(x) = 490 * 0.88^x$

Leo

$x \to g(x)$

$0 \to 480$

$2 \to 360$

$4 \to 470$

Solving (a): The phone with greater initial value

The initial value is when x = 0. So, we have:

$f(x) = 490 * 0.88^x$

$f(0) = 490 * 0.88^0$

$f(0) = 490 * 1$

$f(0) = 490$

From Leo's table

$g(0) = 480$

By comparison;

$f(0) > g(0)$

i.e.

$490 > 480$

<em>So: Tonya's had the greater initial trade-in value</em>

Solving (b): The phone with lesser rate

An exponential function is:

$y = ab^x$

Where:

$b \to rate$

For Tonya

$b = 0.88$

For Leo, we have:

$(x_1,y_1) = (0,480)$

$(x_2,y_2) = (2,360)$

So, the equation becomes:

$y = ab^x$

$480 = ab^0$ and $360 = ab^2$

Solving $480 = ab^0$ , we have:

$480 = a * 1$

$480 = a$

$a= 480$

$360 = ab^2$ becomes

$360 = 480 * b^2$

Divide both sides by 480

$0.75 = b^2$

Take square roots

$0.87 = b$

$b=0.87$ -- Leo's rate

By comparison; Leo's rate is slower i.e. 0.87 < 0.88

6 0

3 years ago

On a blueprint, the scale says that 2 cm represents 3 m. What is the actual length of a wall if its measurement on the blueprint

Leokris [45]

Answer:

The actual length of the wall is 10.5 m

Step-by-step explanation:

Write and solve an equation of ratios to answer this question:

2 cm 3 m

--------- = ---------

7 cm L

Solve this for L by inverting both sides:

7cm L

---------- = --------

2 cm 3 m

and then multiplying both sides by 3m:

----- = L

The actual length of the wall is 10.5 m

4 0

3 years ago

Read 2 more answers

(4k² + 8k +2) - (2k + 3)

Vika [28.1K]

Answer:

Step-by-step explanation:

4k^2 + 8k + 2 - 2k - 3

4k^2 + 6k - 1

answer is B

5 0

3 years ago

Read 2 more answers

"tiply (d + 5)(d - 5)

tamaranim1 [39]

Answer:

i hope its correct

Step-by-step explanation:

d2-5+5d-25

d2-30+5d

8 0

3 years ago

Construct a confidence interval for μd, the mean of the differences d for the population of paired data. Assume that the populat

Lynna [10]

Answer:

Step-by-step explanation:

Group Before After

Mean 80.27 78.27

SD 12.76 12.92

SEM 3.85 3.89

N 11 11

df = 10

standard error of difference = 0.798

The mean of Before minus After equals 2.00

Given a=0.01, |t(0.005, df=10)|=3.17 (check student t table)

So 99% CI is

2±t*s

--> 2±3.17*0.798

--> -0.5 < µd< 4.5

Answer:-0.5 < µd< 4.5

6 0

3 years ago