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3 years ago

Isaiah is saving money every week. Isaiah started with $14 and added $20 every week. Find the rate of change.

Mathematics

2 answers:

Evgesh-ka [11]3 years ago

5 0

Answer:

$20

Step-by-step explanation:

liubo4ka [24]3 years ago

3 0

Answer:

42.86%

Step-by-step explanation:

Rate of change = (change in amount saved / amount first saved) x 100

change in amount saved = $20 - $14 = $6

($6/$14) x 100 = 0.428571 = 42.86%

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qwelly [4]

Answer:

x=-7

Step-by-step explanation:

The sum of the angles of a triangle are 180 degrees

40 + x+57 + 90 =180

Combine like terms

187 +x = 180

Subtract 187 from each side

187-187 +x = 180-187

x = -7

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3 years ago

If a = √3-√11 and b = 1 /a, then find a² - b²

Serga [27]

If $b=\frac1a$ , then by rationalizing the denominator we can rewrite

$b = \dfrac1{\sqrt3-\sqrt{11}} \times \dfrac{\sqrt3+\sqrt{11}}{\sqrt3+\sqrt{11}} = \dfrac{\sqrt3+\sqrt{11}}{\left(\sqrt3\right)^2-\left(\sqrt{11}\right)^2} = -\dfrac{\sqrt3+\sqrt{11}}8$

Now,

$a^2 - b^2 = (a-b) (a+b)$

and

$a - b = \sqrt3 - \sqrt{11} + \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{9\sqrt3 - 7\sqrt{11}}8$

$a + b = \sqrt3 - \sqrt{11} - \dfrac{\sqrt3 + \sqrt{11}}8 = \dfrac{7\sqrt3 - 9\sqrt{11}}8$

$\implies a^2 - b^2 = \dfrac{\left(9\sqrt3 - 7\sqrt{11}\right) \left(7\sqrt3 - 9\sqrt{11}\right)}{64} = \boxed{\dfrac{441 - 65\sqrt{33}}{32}}$

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2 years ago

Natsumi opens a savings account that earns 0.08% interest on the last day of the month. Her initial deposit is $75 on the first

Nitella [24]

Because she doesn't receive any interest on the last month, but puts money in, we can write this equation:

18(75) + 17(0.08(75))

1350 + 1.36(75)

1350 + 102

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6 0

4 years ago

100 points! Please help ASAP! Look at the picture attached. I will mark brainliest. Random answers will be reported

dalvyx [7]

we know that property of in center we get

DW = FW = EW

compare the equations and solve for x:

DW = FW

7x - 13 = 15x - 37

15x - 7x = 37 - 13

8x = 24

x=24/8

x = 3

now

DW = 7x - 13 = 7×3 - 13 = 8 units

The measure of WE is same as DW=WE = 8 units

8 0

3 years ago

Share 13 ones with 2 groups. How many ones are in each group

Yuki888 [10]

Answer:

6.5

Step-by-step explanation:

13 divided by 2 = 6.5

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3 years ago

Isaiah is saving money every week. Isaiah started with $14 and ​added $20 every week. Find the rate of change.

Isaiah is saving money every week. Isaiah started with $14 and added $20 every week. Find the rate of change.