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Elodia [21]
3 years ago
9

What is −2√20−√125 in simplest radical form

Mathematics
1 answer:
erma4kov [3.2K]3 years ago
3 0
-9 \sqrt{4}

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A Starbucks coffee costs $4.50. What is the total price if the sales tax rate is 7%?
Anastaziya [24]

Multiply 4.50 by 0.07

4.50*0.07 = 0.315

Then the sales tax is about $0.32.

You can also do it mentally. Moving the decimal point in 4.50 once to the left gives you 10% of the original amount, 0.45. Move it again to get 1% of the price, 0.045. Then multiply this by 7 to get 7%.

7 0
3 years ago
3x + 8y = 28<br> 3x + 2y = 4<br> Find both the x and y coordinates
umka2103 [35]

Answer:

(- \frac{4}{3}, 4 )

Step-by-step explanation:

Given the 2 equations

3x + 8y = 28 → (1)

3x + 2y = 4 → (2)

Subtracting (2) from (1) term by term will eliminate the x- term

(3x - 3x) + (8y - 2y) = (28 - 4), that is

6y = 24 ( divide both sides by 6 )

y = 4

Substitute y = 4 into either of the 2 equations and solve for x

Substituting into (1)

3x + 8(4) = 28

3x + 32 = 28 ( subtract 32 from both sides )

3x = - 4 ( divide both sides by 3 )

x = - \frac{4}{3}

Solution is (- \frac{4}{3}, 4 )

6 0
3 years ago
Read 2 more answers
Pls help<br><br> Find the surface area of the composite figure.
Dmitry [639]

Answer:

644 cm³

Step-by-step explanation:

Surface area of the composite figure = (surface area of the upper cuboid - base area of upper cuboid) + (surface area of the lower cuboid - base area of the upper cuboid)

✔️Surface area of upper cuboid = 2(LW + LH + WH)

L = 3

W = 3

H = 8

Surface area of upper cuboid = 2(3*3 + 3*8 + 3*8) = 2(9 + 24 + 24) = 114 cm²

✔️Surface area of Surface area of lower cuboid = 2(LW + LH + WH)

L = 12

W = 10

H = 7

Surface area of lower cuboid = 2(12*10 + 12*7 + 10*7) = 2(120 + 84 + 70) = 548 cm²

✔️Base area of upper cuboid = L*W

L = 3

W = 3

Base area = 3*3 = 9 cm²

✅Surface area of the composite figure = (114 - 9) + (548 - 9) = 105 + 539 = 644 cm³

6 0
3 years ago
Can someone help me please this is due tomorrow
solmaris [256]

Answer:

Step-by-step explanation:

5 0
3 years ago
Write the equation of a line that is parallel to y=9, that passes through the point (3,-8)
lisov135 [29]

Answer:

y = -8

Step-by-step explanation:

If the equation is parallel to y = 9, the you already know that the equation must be y = some value. It passes through the point (3,-8). Just put that y value into the equation to get y = -8

4 0
4 years ago
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