Math

Ms. Sue please help!
7. Suppose you earned 7t – 1 dollars on Monday and 8t + 5 dollars on Tuesday. What were your total earnings? Simplify your answer. (1 point)
–t + 4 dollars
–t – 6 dollars
15t – 6 dollars
15t + 4 dollars
8. f 2 ∙ f 3 (1 point)
f 5
f 6
(2f)5
(2f)6
9. 144^14 over 144^2 (1 point)
14416
14412
14428
144^14 over 2
10. equation (1 point)
equation
x48
x19
x13
11. Which of the following expressions is true? (1 point)
43 • 44 = 412
52 • 53 > 55
32 • 35 = 310
52 • 54 < 58
12. Which of the following expressions is true? (1 point)
83 • 82 < 84
44 • 44 = 416
22 • 26 < 28
33 • 33 > 35
For questions 13 and 14, write the value of the expression.

13. equation (1 point)
1
4
5
0
14. equation (1 point)
one over twenty-seven
one over nine
9
–27
For questions 15 and 16, multiply. Write the result in scientific notation.

15. (1.8 • 101)(7 • 105) (1 point)
1.26 • 107
8.8 • 106
8.8 • 105
1.26 • 106
16. (1.7 ∙ 10–4)(5 ∙ 10–5) (1 point)
8.5 ∙ 10–9
8.5 ∙ 1020
6.7 ∙ 10–9
6.7 ∙ 1020
For questions 17–21, simplify the expression.

17. 8t5 ∙ 8t5 (1 point)
64t25
64t10
16t10
16t5

my answers
7.d
8.a
9.b
10.d
11.d
12.d
13.a
14.a
15.a
16.a
17.b

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asked by Austin
  1. It would help if you proofread your questions before you posted them.

    Online "^" is used to indicate and exponent, e.g., x^2 = x squared.

    Online, “*” is used to indicate multiplication.

    7-9. Correct.

    10. There is no equation. Equation requires equal sign (=).

    11. 52 * 54 = 2808 which is not < 58.

    12. Correct.

    13. No equation.

    14. (1.8 * 10^1)(7 * 10^5) = 12.6 * 10 ^6

    I won't respond to the remaining items until you get your notation correct.

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    posted by PsyDAG
  2. the sass is real

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