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2 years ago

Solve the formula D=a+b−c for b in general.

Mathematics

1 answer:

kari74 [83]2 years ago

3 0

Answer:

b = c - a - D

Step-by-step explanation:

$D=a+b−c \\ b = c - a - D$

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An alloy weighing 30 lbs. is 11% tin. The alloy was made by mixing a 15% tin alloy and a 9% tin alloy. How many pounds of each a

Roman55 [17]

Answer:

20 lbs of 9%

10 lbs of 15%

Step-by-step explanation:

x: 9%

y: 15%

x + y = 30

y = 30 - x

0.09x + 0.15y = 0.11(30)

0.09x + 0.15(30 - x) = 3.3

-0.06x = -1.2

x = 20

y = 10

y = 30 - x

3 0

3 years ago

Round 2895 to the nearest 10

SpyIntel [72]

So, in order to round the the tens, we need to look at the ones place.

So we look at the underlined digit and see if it is 5 or higher (it is)

289<u>5</u>

So, since it's 5, we raise the next place up. so now the 10's place has 10, so we need to raise the next place up further.

2900

3 0

3 years ago

Read 2 more answers

The sum of the areas of two circles is 80 pie square meters. Find the length of a radius of each circle if one of them is twice

Svetach [21]

Answer:

The radius of the circles are $4\ m$ and $8\ m$

Step-by-step explanation:

Let

x-----> the radius of larger circle

y----> the radius of smaller circle

we know that

$\pi x^{2} +\pi y^{2}=80\pi$

$x^{2} +y^{2}=80$ -----> equation A

Remember that

$x=2y$ -----> equation B

substitute equation B in equation A and solve for y

$(2y)^{2} +y^{2}=80$

$4y^{2} +y^{2}=80$

$5y^{2}=80$

$y^{2}=16$

$y=4\ m$

Find the value of x

$x=2y$

$x=2(4)=8\ m$

therefore

The radius of the circles are $4\ m$ and $8\ m$

4 0

2 years ago

Factor the expression completely -9.75 + 3.25x

makvit [3.9K]

3.25*(x-3)

Just take out a 3.25

6 0

3 years ago

Jeff wants to know how many miles it is from his house to school. On a map the distance is 3 inches. If the scale is 1/2 inch fo

frez [133]

Answer:

12 miles

Step-by-step explanation:

1/2 inch per 2 miles

3 inches away

3 ÷ 1/2 = 6

6 * 2 = 12

8 0

2 years ago