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notsponge [240]
4 years ago
10

A student solved the equation 2x+2=10 using algebra tiles. She incorrectly says the solution is 6 . Solve the equation. What mis

take might the student have​ made?

Mathematics
2 answers:
Alex_Xolod [135]4 years ago
7 0

Answer:

she added 2 instead of subtracting it. the answer is x=4

Step-by-step explanation:

10+2=12

12/2=6

enot [183]4 years ago
3 0

Answer:

Step-by-step explanation:

2x+2=10 subtract 2 from each side

2x=8 divide each side by 2

x=4 is the correct solution.

Her error was most likely subtracting 2 from the left and adding 2 to the right

2x+2=10

2x=12

x=6

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The ratio of solid beads to clear beads in a vase is 820. Select all the correct statements that tell if the operations will giv
Tatiana [17]

Answer:

C, D and E

Step-by-step explanation:

Given

Represent solid beads with S and clear beads with C

So:

S:C = 8:20

Required

Select operations that give an equivalent ratio

First, we need to get the unit ratio

S:C = 8:20

Divide through by 4

S:C = 2:5 -- This means that, after any operation. The equivalent ratio must be 2: 5

Option A: Add 2 to S and 2 to C

S:C = 8:20

Perform the operation

S:C = 8 + 2 : 20 + 2

S:C = 10 : 22

Divide through by 2

S:C = 5:11

Option B: Subtract 8 from S and 6 from C

S:C = 8:20

Perform the operation

S:C = 8 - 8 : 20 - 6

S:C = 0 : 14

Option C: Multiply S and C by 2

S:C = 8:20

Perform the operation

S:C = 8*2:20*2

S:C = 16:40

Divide through by 8

S:C = 2:5

Option D: Divide S and C by 4

S:C = 8:20

Perform the operation

S:C = 8/2:20/4

S:C = 2:5

Option E: Multiply S and C by 18

S:C = 8:20

Perform the operation

S:C = 8*18:20*18

S:C = 144:360

Divide through by 72

S:C = 144/72:360/72

S:C = 2:5

<em>From the calculations above, options C, D and E gave an equivalent of 2:5.</em>

5 0
3 years ago
Which estimate is the most reasonable for this problem?
Ber [7]
B.
8.000 km because you round 9,162 down to 9,000 and round 969 to 1000 then subtract
4 0
3 years ago
Let f(x)=x^3+3 and g(x) = 2x^2 + 2x +1. What is g(f(-2))?
emmasim [6.3K]

Answer:

61

Step-by-step explanation:

This composite function can be easily solved

First solve f(-2)

f(-2)=(-2)³+3

f(-2)=-8+3=-5

Now plug -5 for x in function g(x)

=2(5)²+2(5)+1

=50+10+1

=61

5 0
3 years ago
Read 2 more answers
(1) The roots of 3x - 5 = 7 is x = 4​
aivan3 [116]

Answer:

it's right

Step-by-step explanation:

3x - 5 = 7

3x = 7 + 5

3x = 12

x = 12/3

x = 4

6 0
4 years ago
A cylindrical vase has height 17 inches and radius 3 inches.
harkovskaia [24]

Answer: 4.25 or 17/4 is the height


Step-by-step explanation:

V=pi*r^2*h

We set them equal to each other and solve for h

pi*3^2*17=pi*6^2*h

h=9*17/36=153/36=4.25=17/4


8 0
4 years ago
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