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3 years ago

Which expression has a value of 20?

Mathematics

2 answers:

matrenka [14]3 years ago

4 0

Answer:

Step-by-step explanation:

tresset_1 [31]3 years ago

3 0

The second expression, (16-8)x2+4, has a value of 20. The parentheses should be done first, which gives you (8)x2+4. Then multiplication, which gives you 16+4. Last, addition, which gives a final answer of 20. Hope this helps!

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Laney is 4 feet 8 inches tall. There are 2.54 centimeters in 1 inch. What is Laney’s height in centimeters

love history [14]

Solve

Given: 2.54cm = 1 inch

To find: 4 feet 8 inches in centimeters

If 1 inch is 2.45cm,

Divide 2.45 by 1

Then multiply it by 4.8

Final answer: 146.3cm in nearest tenth.

6 0

3 years ago

Can somebody help me with the Math's questions on Pythagoras Theorem? Thanks

olga2289 [7]

Answer:

2.4 cans cost 47.4

If you cannot buy 2.4 cans, you must buy 3 cans, then you'll pay 59.25

Step-by-step explanation:

The lawn has trapezoidal shape, so find the area of the trapezoid using formula

$A=\text{Midline}\times \text{Height}$

In the diagram, ABED is rectangle, so BE = 12 m, thus ED = 20 m - 12 m = 8 m.

Consider right triangle EDC. By the Pythagorean theorem,

$ED^2+EC^2=CD^2\\ \\ED^2+8^2=17^2\\ \\ED^2=289-64\\ \\ED^2=225\\ \\ED=15\ m$

Thue,

Height = 15 m

Find the midline:

$\text{Midline}=\dfrac{AD+BC}{2}=\dfrac{12+20}{2}=16\ m$

Hence,

$A=16\cdot 15=240\ m^2$

One can cover $100\ m^2,$ to cover $240\ m^2$ is needed

$240:100=2.4$ cans

One can costs 19.75, so 2.4 cans cost

$19.75\cdot 2.4=47.4$

If you cannot buy 2.4 cans, you must buy 3 cans, then you'll pay

$19.75\cdot 3=59.25$

4 0

4 years ago

A new 2006 Honda head was values at $25000. It depresides at a rate of 13% a year.

CaHeK987 [17]

Answer:

1. It's value in 2009 was $16,462.575

2. It's value in 2020 will be $3,558.

Step-by-step explanation:

The equation for the value of car after t years has the following format.

$V(t) = V(0)(1-r)^{t}$

In which V(t) is the value after t years, V(0) is the initial value and r is the ratio of depreciation.

In this problem, we have that:

$V(0) = 25000, r = 0.13$

$V(t) = V(0)(1-r)^{t}$

$V(t) = 25000(1-0.13)^{t}$

$V(t) = 25000(0.87)^{t}$

1. What was its value in 2009

2009 is 3 years after 2006, so this is V(3)

$V(t) = 25000(0.87)^{t}$

$V(3) = 25000(0.87)^{3}$

$V(3) = 16462.575$

It's value in 2009 was $16,462.575

2.What will be its value in 2020?

2020 is 14 years after 2006, so this is V14)

$V(t) = 25000(0.87)^{t}$

$V(14) = 25000(0.87)^{14}$

$V(14) = 3558$

It's value in 2020 will be $3,558.

8 0

3 years ago

2(x-4) + 3x-x² for x = 3.

finlep [7]

Answer:

-2

Step-by-step explanation:

$2(3-4) +3(3)-3^2\\= 2(-1) + 3(3) -3^2\\= -2 + 9 - 9\\= -2$

8 0

2 years ago

Can some one help me wit this

Irina18 [472]

The answer is B, or y - 6 = 3/4 (x - 4). To put (-4, 6); m = 3/4 in point-slope form, you first start with the point-slope form equation which is y - k = m (x - h). The ordered pair that it wants you to put in is (-4, 6). To figure out where the ordered pair goes, you replace the variables (h, k) with (-4, 6). The h will always be the point on the
x-axis and the k will always will be the point on the y-axis. Putting these together, you now get y - 6 = m (x - 4). As the same in slope-intercept form, or y=mx+b form, the slope in this equation is m. In this equation, m = 3/4. So, the equation in point-slope form is y - 6 = 3/4 (x - 4).

4 0

3 years ago