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Andreas93 [3]
3 years ago
13

In Zachs class 3/5 of the 25 students are boys. How many boys are in Zachs class?

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
4 0

Answer:

15

Step-by-step explanation:

(3/5)*25=15

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What is the simplified form of each expression?<br><br> (7 – c)(–1)
Zigmanuir [339]

Answer:

-7+c

Step-by-step explanation:

distribute the - 1

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3 years ago
What is the surface area of the solid shown below?
Ugo [173]

Answer:

\text{C. }156\:\mathrm{cm^3}

Step-by-step explanation:

The surface area of the triangular prism consists of three rectangles and two triangles.

Rectangle One - 5 x 12 = 60 cm^2

Rectangle Two - 4 x 12 = 48 cm^2

Rectangle Three - 3 x 12 = 36 cm^2

Triangles - 2 x 1/2 x 3 x 4 = 12 cm^2

Thus, the total surface area of the solid is 60+48+36+12=\boxed{\text{C. }156\:\mathrm{cm^3}}

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3 years ago
A student’s height is 145cm. He goes to a pond where the average water depth is 110cm. Does this student have a risk in the pond
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3 0
3 years ago
Find the root of 11+2square30
EleoNora [17]

\\ \sf\longmapsto \sqrt{11+2^230}

\\ \sf\longmapsto \sqrt{11+4(30)}

\\ \sf\longmapsto \sqrt{11+120}

\\ \sf\longmapsto \sqrt{131}

\\ \sf\longmapsto 11.3

5 0
2 years ago
Is the solution of this equation extraneous?
UkoKoshka [18]

Answer:

x = - 3 is extraneous

Step-by-step explanation:

Given

\sqrt{x+7} - 1 = x  ( add 1 to both sides )

\sqrt{x+7} = x + 1 ( square both sides )

x + 7 = (x + 1)² ← distribute right side

x + 7 = x² + 2x + 1 ( subtract x + 7 from both sides )

0 = x² + x - 6 ← in standard form

0 = (x + 3)(x - 2) ← in factored form

Equate each factor to zero and solve for x

x + 3 = 0 ⇒ x = - 3

x - 2 = 0 ⇒ x = 2

As a check

Substitute these values into the equation and if both sides are equal then they are the solutions.

x = - 3 : \sqrt{-3+7} - 1 = \sqrt{4} - 1 = 2 - 1 = 1 ≠ - 3

x = 2 : \sqrt{2+7} - 1  = \sqrt{9} - 1 = 3 - 1 = 2

x = 2 is a solution and x = - 3 is extraneous

6 0
3 years ago
Read 2 more answers
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