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3 years ago

Mrs. Morales wrote a test with 16 questions covering spelling and vocabulary. Spelling questions (x) are

Mathematics

1 answer:

fiasKO [112]3 years ago

8 0

Answer:

Step-by-step explanation:

X+Y = 15

<h3>Sum of two types of question is 15</h3>

x+y-x = -x+15

5(x)+10(y)=100

5x+10y=100

<h3>Total no. if points is 100</h3>

5x+10y-5x=-5x+100

10y= -5x+100

y=5/10x + 100/10

y= -1/2x+10

<h3>Slope intercept form</h3>

(10,5)

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To find the surface area of the pyramid, in square inches, Vikram wrote (33.2) (34.2) + 4 (one-half (34.2) (28.4)). What error d

madam [21]

Answer:

B. He used the wrong expression to represent the area of the base of the pyramid.

Step-by-step explanation:

Given

See attachment for pyramid

$Area = (33.2)(34.2) + 4 * \frac{1}{2} * 34.4 * 28.4$

Required

Vikram's error

The surface area of a square pyramid is:

$Area = Base\ Area + 4 * Area \triangle$

Where

$Base\ Area = Length * Length$

$Base\ Area = 34.2 * 34.2$

$4 * Area \triangle = 4 * \frac{1}{2} * Base * Height$

$4 * Area \triangle = 4 * \frac{1}{2} * 34.2 * 28.4$

So:

$Area = Base\ Area + 4 * Area \triangle$

$Area = 34.2 * 34.2 + 4 * \frac{1}{2} * 34.2 * 28.4$

By comparing the calculated expression with

$Area = (33.2)(34.2) + 4 * \frac{1}{2} * 34.4 * 28.4$

Option (b) is correct

3 0

3 years ago

Quadrilateral ABCD is inscribed in this circle.

Sedbober [7]

The answer to this is 65.

Remember that the angles opposite of each other equal to 180. So a+c=180 and b+d=180.

First, we solve for x. Since we know that b and d equal to 180, we subtract 148 from 180.
180-148=32. x=32.

Then we plug that in the expression for angle a.
2x+1 becomes 2(32)+1
2*32=64
64+1=65.
a=65

4 0

3 years ago

The radius of the circular track was 157.64 feet find the circumference of the track

DerKrebs [107]

Before we solve for anything, let's remember what our formula is.

The circumference of a circle is 2PiR (2 x Pi x R).

Our radius is 157.64.
Pi is 3.14 (estimated).

Let's plug our numbers into the formula.

Circumference = 2 x 3.14 x 157.64.
2 x 3.14 = 6.28
6.28 x 157.64 = 989.979 (990 if estimated).

Your circumference is:
989.979 ft^2.

I hope this helps!

7 0

3 years ago

Use the substitution method to solve the system of equations. Choose the correct ordered pair.

Vilka [71]

Answer:

(3, 1)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS
Equality Properties

<u>Algebra I</u>

Solving systems of equations using substitution/elimination

Step-by-step explanation:

<u>Step 1: Define systems</u>

3x + y = 10

y = x - 2

<u>Step 2: Solve for </u><em><u>x</u></em>

Substitute: 3x + (x - 2) = 10
Combine like terms: 4x - 2 = 10
Isolate <em>x </em>term: 4x = 12
Isolate <em>x</em>: x = 3

<u>Step 3: Solve for </u><em><u>y</u></em>

Define original equation: y = x - 2
Substitute in <em>x</em>: y = 3 - 2
Subtract: y = 1

And we have our answer!

3 0

3 years ago

Help plz:)))I’ll mark u Brainliest

babunello [35]

Answer:

h = 9

Step-by-step explanation:

cylinder A = $\pi$ $3^{2}$ *4 = 113.0973355 $m^{3}$

Cylinder B = 113.0973355 $m^{3}$

113.0973355 $m^{3}$ = $\pi$ $2^{2}$ *h

113.0973355 $m^{3}$ / 4 $\pi$ = h

8.999999999998 = h

I think b/c of the rounding error of rounding off pi, that h= 9

5 0

3 years ago