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ICE Princess25 [194]
3 years ago
11

I need help on this math problem?!

Mathematics
1 answer:
Natalka [10]3 years ago
3 0

Hello from MrBillDoesMath!

Answer:

This is the second choice from the top  ( - 5.81)


Discussion:

The five terms are:

-3 - 3/2 - 3/4 -3/8 - 3/16 =

-3 ( 1 + 1/2 + 1/4 + 1/8 + 1/16) =

-3 (31/16) =

-93/16 =

-5 13/16 =

- 5.8125  ( approximately)


This is the second choice from the top

Thank you,

MrB

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The square of a number plus three times the number is 70. find the numbers.
Harrizon [31]

Answer:

Step-by-step explanation:

The equation for that is

x^2+3x=70

If we subtract over the 70, we have a quadratic that we can factor to solve for the values of x that will make that equation true.

x^2+3x-70=0

Now we need the factors of 70 that will either add or subtract to give us the linear term of 3. The factors of 70 that will work are 10 and 7. 10 times 7 is 70, and 10 - 7 = 3:

x^2+10x-7x-70=0 and now we will factor by grouping:

(x^2+10x)-(7x-70)=0 and factor out what's common:

x(x+10)-7(x+10)=0

The factor (x + 10) is common, so we will now factor that out:

(x+10)(x-7)=0

By the Zero Product Property, either x + 10 = 0 or x - 7 = 0, so x = -10 or 7

Those are the 2 numbers that will work.

(-10)^2+3(-10)=70 simplifies to

100 - 30 which does in fact equal 70. OR

(7)^2+3(7)=70 which simplifies to

49 + 21 which also equals 70.

So you're done!

3 0
3 years ago
Estimate the area of Alberta in square miles. Show your reasoning
ella [17]

Answer:  About 278,250\ mi^2

Step-by-step explanation:

The missing figure is attached.

Notice in the first picture that Alberta has a complex shape.

You can calculate the area of a complex shape by decomposing it into polygons whose areas can be calculated easily.

Observe the second picture. Notice that it can be descompose into two polygons: A trapezoid and a rectangle.

The area of the trapezoid  can be calcualted with the formula:

A_t=\frac{h}{2}(B+b)

Where "h" is the height, "B" is the long base and "b" is short base.

And the area of the rectangle can be found with the formula:

 A_r=lw

Wkere "l" is the lenght and "w" is the width.

Then, the apprximate area of Alberta is:

A=\frac{h}{2}(B+b)+lw

Substituting vallues, you get:

A=(\frac{(410\ mi-180\ mi)}{2})(760\ mi+470\ mi)+(180\ mi)(760\ im)\\\\A=141,450\ mi^2+136,800\ mi^2\\\\A=278,250\ mi^2

Therefore, the area of of Alberta is about 278,250\ mi^2.

5 0
3 years ago
Maria and her family drove 885 miles on their summer vacation. The first 8 on the left in this number has a ____ of 800
Rudiy27
The first 8 on the left in this. umber has a VALUE of 800. :)
5 0
3 years ago
Read 2 more answers
Can someone help me with 19,20,and 21 will mark brainiest for the first answer and it has to be correct
Archy [21]
Do you need help with all of these?

3 0
3 years ago
Linda is running the concession stand at a basketball game. She sells hot dogs fir $2 and drinks for $1.50. She made a total of
Ede4ka [16]

Answer:

53 hotdogs

Step-by-step explanation:

1.50 x 64 = 96

202 - 96 = 106

106 ÷ 2 = 53

6 0
3 years ago
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